# Syntax locality ICL experiment report

## 1. Run status and summary

Status: **provisional / incomplete run**. synthetic_mock=false.

Strict model-evaluable accuracy: 67.969%. Both full-program directions are exploratory.

## 2. Experiment conditions

Preset: pilot; phase: p2; model: `gpt-5.6-terra`; started: 2026-10-06T08:10:58.656249200Z; protocol version: 2; protocol hash: `2ac04cc60928800d0c1fdd37986546a6fee23bd1955ccc011c76099cbde60471`.

Bootstrap seed: 2026100602; iterations when eligible: 10,000; unit: structural family; strata: depth × filler; lexical regimes: natural, nonce.

```
{"bootstrapSeed":2026100602,"concurrency":2,"depths":[2,4,8,16],"fewShotCount":8,"fillersGeneration":[0,8,32],"fillersReading":[0,8,32],"generatorVersion":"1","masterSeed":2026100602,"maxOutputTokensGeneration":16384,"maxOutputTokensReading":8192,"maxRpm":2E+1,"maxTpm":6E+4,"model":"gpt-5.6-terra","promptVersion":"2","reasoningEffort":"low","replicates":1,"scorerVersion":"2","seedsPerCell":4,"sourceHash":"41ffc2647b8f3c3838a17c2425b0be97007fe611f5d0a68d3dd9d1c79e1b0b96","tasks":["ast_to_source","source_to_ast"]}
```

## 3. Planned / executed counts and missingness

| planned | dispatched | terminal | model-evaluable | correct | infrastructure missing | not-dispatched | incomplete | refusal |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 960 | 519 | 521 | 512 | 348 | 7 | 441 | 0 | 0 |

Operational success correct/dispatched: 67.052%; upper bound if unresolved dispatched outcomes all succeed: 67.052%.

Missing trials are not model errors. Comparison sensitivity bounds in paired-comparisons.csv assign all non-evaluable planned outcomes against / in favor of D.

## 4. Exploratory parsing and generation D−B comparisons

| task | view | contrast | families | effect pp | 95% CI pp | discordant | CI status |
| --- | --- | --- | --- | --- | --- | --- | --- |
| ast_to_source | complete | named_end − generic_end | 15/48 | NA | not_computed | 8 | not_computed |
| source_to_ast | complete | named_end − generic_end | 12/48 | NA | not_computed | 4 | not_computed |

No confirmatory reading-primary comparison is planned in P2. Parsing and generation remain separate outcomes.

Replicates are averaged within family and lexical regime, regimes have equal weight, and depth × filler cells have equal weight. A wholly missing planned cell leaves the overall effect undefined. Exact McNemar values, where available for single-regime unaveraged binary family pairs, are descriptive.

## 5. Five syntaxes: accuracy, truncation, and usage

| task | view | style | evaluable | accuracy | incomplete | input known | output known | reasoning known | cached known | tokens/correct | retry rate | mean latency ms |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| ast_to_source | complete | braces | 54 | 61.111% | 0 | 393965 | 21019 | 6135 | 0 | NA | 0.000% | 51626.273 |
| ast_to_source | complete | generic_end | 54 | 46.296% | 0 | 396332 | 20712 | 5593 | 0 | NA | 0.000% | 50287.071 |
| ast_to_source | complete | named_end | 53 | 98.113% | 0 | 404478 | 24432 | 5638 | 0 | NA | 0.000% | 1712559.000 |
| ast_to_source | complete | padded_end | 53 | 45.283% | 0 | 398501 | 22677 | 6023 | 0 | NA | 0.000% | 1715364.127 |
| ast_to_source | complete | typed_end | 54 | 62.963% | 0 | 399920 | 20863 | 4762 | 0 | NA | 0.000% | 47376.945 |
| source_to_ast | complete | braces | 49 | 71.429% | 0 | 197896 | 31311 | 4502 | 0 | 6548.771 | 0.000% | 49448.041 |
| source_to_ast | complete | generic_end | 48 | 70.833% | 0 | 196555 | 32698 | 6559 | 0 | NA | 0.000% | 55917.694 |
| source_to_ast | complete | named_end | 49 | 73.469% | 0 | 218397 | 31231 | 4425 | 0 | 6934.111 | 0.000% | 56327.653 |
| source_to_ast | complete | padded_end | 49 | 75.510% | 0 | 211321 | 33324 | 6521 | 0 | 6612.027 | 0.000% | 54166.857 |
| source_to_ast | complete | typed_end | 49 | 77.551% | 0 | 204777 | 33093 | 6299 | 0 | 6259.737 | 0.000% | 58530.041 |

Known tokens from unique final trial usage: 3293502; known generation-attempt tokens across retries: 3293502; trials without full input/output usage: 448; generation attempts without full usage: 7.

HTTP attempts (count, generation, retry): 1041; known estimated cost USD: NA; cost-known trials: 0 / 960. Estimates are not verified billing or free-quota balances.

Unknown usage is excluded from known sums and explicitly counted, never replaced with a zero estimate. Cost ratios are NA when usage is incomplete or there are no correct answers. summary.csv separately reports unique-trial and all-generation-attempt tokens per correct result. Non-reasoning output is output minus reasoning only where both fields exist; it is not an exact answer-text token count. Retried and non-retried latency summaries are in summary.csv.

## 6. Lexical regime, depth, and filler breakdown

Full task/view/style/natural-or-nonce/depth/filler counts, usage completeness, and outcomes are in [summary.csv](summary.csv). Each row preserves its original trial denominator.

| task | view | lexical | depth | filler | planned | evaluable | accuracy | infra missing |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| ast_to_source | complete | natural | 2 | 0 | 20 | 10 | 100.000% | 0 |
| ast_to_source | complete | natural | 2 | 8 | 20 | 15 | 100.000% | 0 |
| ast_to_source | complete | natural | 2 | 32 | 20 | 15 | 100.000% | 0 |
| ast_to_source | complete | natural | 4 | 0 | 20 | 20 | 80.000% | 0 |
| ast_to_source | complete | natural | 4 | 8 | 20 | 0 | NA | 0 |
| ast_to_source | complete | natural | 4 | 32 | 20 | 5 | 80.000% | 0 |
| ast_to_source | complete | natural | 8 | 0 | 20 | 10 | 60.000% | 0 |
| ast_to_source | complete | natural | 8 | 8 | 20 | 13 | 46.154% | 0 |
| ast_to_source | complete | natural | 8 | 32 | 20 | 10 | 30.000% | 0 |
| ast_to_source | complete | natural | 16 | 0 | 20 | 20 | 20.000% | 0 |
| ast_to_source | complete | natural | 16 | 8 | 20 | 10 | 30.000% | 0 |
| ast_to_source | complete | natural | 16 | 32 | 20 | 10 | 10.000% | 0 |
| ast_to_source | complete | nonce | 2 | 0 | 20 | 10 | 100.000% | 0 |
| ast_to_source | complete | nonce | 2 | 8 | 20 | 5 | 100.000% | 0 |
| ast_to_source | complete | nonce | 2 | 32 | 20 | 20 | 100.000% | 0 |
| ast_to_source | complete | nonce | 4 | 0 | 20 | 20 | 85.000% | 0 |
| ast_to_source | complete | nonce | 4 | 8 | 20 | 10 | 100.000% | 0 |
| ast_to_source | complete | nonce | 4 | 32 | 20 | 10 | 80.000% | 0 |
| ast_to_source | complete | nonce | 8 | 0 | 20 | 10 | 40.000% | 0 |
| ast_to_source | complete | nonce | 8 | 8 | 20 | 5 | 20.000% | 5 |
| ast_to_source | complete | nonce | 8 | 32 | 20 | 5 | 20.000% | 0 |
| ast_to_source | complete | nonce | 16 | 0 | 20 | 15 | 20.000% | 0 |
| ast_to_source | complete | nonce | 16 | 8 | 20 | 15 | 20.000% | 0 |
| ast_to_source | complete | nonce | 16 | 32 | 20 | 5 | 60.000% | 1 |
| source_to_ast | complete | natural | 2 | 0 | 20 | 5 | 100.000% | 0 |
| source_to_ast | complete | natural | 2 | 8 | 20 | 10 | 100.000% | 0 |
| source_to_ast | complete | natural | 2 | 32 | 20 | 5 | 100.000% | 0 |
| source_to_ast | complete | natural | 4 | 0 | 20 | 15 | 100.000% | 0 |
| source_to_ast | complete | natural | 4 | 8 | 20 | 15 | 100.000% | 0 |
| source_to_ast | complete | natural | 4 | 32 | 20 | 5 | 100.000% | 0 |
| source_to_ast | complete | natural | 8 | 0 | 20 | 10 | 80.000% | 0 |
| source_to_ast | complete | natural | 8 | 8 | 20 | 0 | NA | 0 |
| source_to_ast | complete | natural | 8 | 32 | 20 | 10 | 60.000% | 0 |
| source_to_ast | complete | natural | 16 | 0 | 20 | 15 | 40.000% | 0 |
| source_to_ast | complete | natural | 16 | 8 | 20 | 5 | 20.000% | 0 |
| source_to_ast | complete | natural | 16 | 32 | 20 | 15 | 20.000% | 0 |
| source_to_ast | complete | nonce | 2 | 0 | 20 | 5 | 100.000% | 0 |
| source_to_ast | complete | nonce | 2 | 8 | 20 | 20 | 100.000% | 0 |
| source_to_ast | complete | nonce | 2 | 32 | 20 | 10 | 90.000% | 0 |
| source_to_ast | complete | nonce | 4 | 0 | 20 | 10 | 100.000% | 0 |
| source_to_ast | complete | nonce | 4 | 8 | 20 | 5 | 100.000% | 0 |
| source_to_ast | complete | nonce | 4 | 32 | 20 | 10 | 100.000% | 0 |
| source_to_ast | complete | nonce | 8 | 0 | 20 | 15 | 100.000% | 0 |
| source_to_ast | complete | nonce | 8 | 8 | 20 | 15 | 60.000% | 0 |
| source_to_ast | complete | nonce | 8 | 32 | 20 | 10 | 90.000% | 0 |
| source_to_ast | complete | nonce | 16 | 0 | 20 | 14 | 28.571% | 1 |
| source_to_ast | complete | nonce | 16 | 8 | 20 | 10 | 20.000% | 0 |
| source_to_ast | complete | nonce | 16 | 32 | 20 | 10 | 30.000% | 0 |

## 7. Exploratory paired comparisons

| task | view | contrast | families | effect pp | 95% CI pp | discordant | CI status |
| --- | --- | --- | --- | --- | --- | --- | --- |
| ast_to_source | complete | named_end − padded_end | 15/48 | NA | not_computed | 8 | not_computed |
| ast_to_source | complete | named_end − typed_end | 15/48 | NA | not_computed | 5 | not_computed |
| ast_to_source | complete | typed_end − generic_end | 15/48 | NA | not_computed | 4 | not_computed |
| ast_to_source | complete | named_end − braces | 15/48 | NA | not_computed | 5 | not_computed |
| source_to_ast | complete | named_end − padded_end | 13/48 | NA | not_computed | 2 | not_computed |
| source_to_ast | complete | named_end − typed_end | 13/48 | NA | not_computed | 5 | not_computed |
| source_to_ast | complete | typed_end − generic_end | 12/48 | NA | not_computed | 5 | not_computed |
| source_to_ast | complete | named_end − braces | 13/48 | NA | not_computed | 4 | not_computed |

All D−E, D−C, C−B, A contrasts, other tasks/views, and pilot comparisons are exploratory unless a separate testing plan was frozen. See [paired-comparisons.csv](paired-comparisons.csv).

## 8. Full-program parsing and generation

Tasks actually planned in this saved run: ast_to_source, source_to_ast.

Source-to-AST is manual parsing: the model receives complete rendered source and returns nested AST JSON without using a parser tool. AST-to-source receives a shuffled AST table and returns complete program source. The directions share structural families and the example bank, but their input/output representations are not symmetric. Exact AST equality is scored separately for each direction.

For source_to_ast, syntax_valid and strict_syntax_validity describe the returned JSON AST schema, not the source language's syntax. For ast_to_source they describe the generated source grammar. Schema-valid but incorrect ASTs fail strict correctness. AST codec and mismatch diagnostics are retained in scores.jsonl, errors.csv, and the failure examples.

Compare task-specific effects and output tokens in the tables; parsing and generation improvements are separate observations.

## 9. Representative failures

### ast_to_source

### D correct / B wrong

**named_end**; trial `09176ac607c7563802361aa43c6c65eaef4e44c3da11e88be628781d271fd957`; outcome `correct`; gold `fal x_a 5594
nezu n_sogvihzg
fal x_a 1099
kiv p_rzbpbpfy
wor nezu n_sogvihzg
jomi n_hekhyacq
fal x_a 3863
nezu n_tsocmkmc
fal x_a 7286
jomi n_jpmxblkx
fal x_a 9924
sapu n_fcuiifcd
fal x_a 6555
kiv p_vdrvvmes
wor sapu n_fcuiifcd
jomi n_hryvqzqy
fal x_a 4232
jomi n_xnmbanvl
fal x_a 5391
jomi n_zhamktmu
fal x_a 5952
jomi n_jqfandro
fal x_a 6359
sapu n_zelwcebd
fal x_a 1781
wor sapu n_zelwcebd
wor jomi n_jqfandro
wor jomi n_zhamktmu
wor jomi n_xnmbanvl
wor jomi n_hryvqzqy
wor jomi n_jpmxblkx
wor nezu n_tsocmkmc
wor jomi n_hekhyacq
`.

Input:

Full input: [failure-inputs/09176ac607c7563802361aa43c6c65eaef4e44c3da11e88be628781d271fd957.txt](failure-inputs/09176ac607c7563802361aa43c6c65eaef4e44c3da11e88be628781d271fd957.txt). Excerpt lines 1–40 of 407:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Translate the neutral AST table into a complete program in the following scope language.
Every block, regardless of its kind, creates a local scope.
ROOT is the implicit global scope and produces no source line. SCOPE opens a block and must be closed after its children.
LET binds its variable to its value. NOP produces a no-effect statement with its payload.
Each node's parent identifies its containing body. The order field gives the statement order within that body.
Rows are in parent-before-child order; their presentation order does not give statement order.
Node IDs are references for the table only and must not appear in source.
Use the grammar's keywords for the table's semantic kinds unit, func, and area.
Return only the complete program, without Markdown fences or explanation.

SYNTAX
The kind keywords are nezu for unit, sapu for func, and jomi for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with wor KIND NAME on one line. KIND and NAME must repeat that block's opening keyword and name.
KIND is one of nezu, sapu, jomi; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is fal VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is kiv PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
AST table:
node	parent	order	tag	kind	name	variable	value	payload
d_gumlepvgmqdg	-	0	ROOT	-	-	-	-	-
d_nfvvsynsuqgi	d_gumlepvgmqdg	2	SCOPE	area	n_imcgrbkz	-	-	-
d_pdxazieddoep	d_nfvvsynsuqgi	1	NOP	-	-	-	-	p_qdggfdxg
d_flulkgesbefl	d_nfvvsynsuqgi	0	LET	-	-	x_a	7207	-
d_ojqpjszuogad	d_gumlepvgmqdg	0	LET	-	-	x_b	1898	-
d_igoqxcjvdfrk	d_gumlepvgmqdg	1	LET	-	-	x_a	9018	-
d_lxbyhxmlmxzv	d_gumlepvgmqdg	3	SCOPE	area	n_kamcsxht	-	-	-
d_ksmckctzaqsk	d_lxbyhxmlmxzv	1	SCOPE	func	n_iqloaety	-	-	-
d_gxxliwgbdsyd	d_ksmckctzaqsk	0	LET	-	-	x_a	7330	-
d_ptyrbyotvcja	d_lxbyhxmlmxzv	0	LET	-	-	x_a	8346	-
d_zijexbszbckb	d_lxbyhxmlmxzv	2	SCOPE	unit	n_zsweikhp	-	-	-
d_odtrqtqxjhfs	d_ksmckctzaqsk	1	NOP	-	-	-	-	p_eeughnii
d_qahetcbeqykm	d_zijexbszbckb	0	LET	-	-	x_a	5661	-
Program:
```

Raw answer:

```
fal x_a 5594
nezu n_sogvihzg
fal x_a 1099
kiv p_rzbpbpfy
wor nezu n_sogvihzg
jomi n_hekhyacq
fal x_a 3863
nezu n_tsocmkmc
fal x_a 7286
jomi n_jpmxblkx
fal x_a 9924
sapu n_fcuiifcd
fal x_a 6555
kiv p_vdrvvmes
wor sapu n_fcuiifcd
jomi n_hryvqzqy
fal x_a 4232
jomi n_xnmbanvl
fal x_a 5391
jomi n_zhamktmu
fal x_a 5952
jomi n_jqfandro
fal x_a 6359
sapu n_zelwcebd
fal x_a 1781
wor sapu n_zelwcebd
wor jomi n_jqfandro
wor jomi n_zhamktmu
wor jomi n_xnmbanvl
wor jomi n_hryvqzqy
wor jomi n_jpmxblkx
wor nezu n_tsocmkmc
wor jomi n_hekhyacq
```

**generic_end**; trial `1a1a844fc0dbd5b25a52bd6cd78d1360c1807251065d37cfd2ebc87f2a3ff7e4`; outcome `invalid_generated_syntax`; gold `fal x_a 5594
nezu n_sogvihzg
fal x_a 1099
kiv p_rzbpbpfy
wor
jomi n_hekhyacq
fal x_a 3863
nezu n_tsocmkmc
fal x_a 7286
jomi n_jpmxblkx
fal x_a 9924
sapu n_fcuiifcd
fal x_a 6555
kiv p_vdrvvmes
wor
jomi n_hryvqzqy
fal x_a 4232
jomi n_xnmbanvl
fal x_a 5391
jomi n_zhamktmu
fal x_a 5952
jomi n_jqfandro
fal x_a 6359
sapu n_zelwcebd
fal x_a 1781
wor
wor
wor
wor
wor
wor
wor
wor
`.

Input:

Full input: [failure-inputs/1a1a844fc0dbd5b25a52bd6cd78d1360c1807251065d37cfd2ebc87f2a3ff7e4.txt](failure-inputs/1a1a844fc0dbd5b25a52bd6cd78d1360c1807251065d37cfd2ebc87f2a3ff7e4.txt). Excerpt lines 1–40 of 407:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Translate the neutral AST table into a complete program in the following scope language.
Every block, regardless of its kind, creates a local scope.
ROOT is the implicit global scope and produces no source line. SCOPE opens a block and must be closed after its children.
LET binds its variable to its value. NOP produces a no-effect statement with its payload.
Each node's parent identifies its containing body. The order field gives the statement order within that body.
Rows are in parent-before-child order; their presentation order does not give statement order.
Node IDs are references for the table only and must not appear in source.
Use the grammar's keywords for the table's semantic kinds unit, func, and area.
Return only the complete program, without Markdown fences or explanation.

SYNTAX
The kind keywords are nezu for unit, sapu for func, and jomi for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with wor on its own line.
KIND is one of nezu, sapu, jomi; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is fal VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is kiv PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
AST table:
node	parent	order	tag	kind	name	variable	value	payload
d_gumlepvgmqdg	-	0	ROOT	-	-	-	-	-
d_nfvvsynsuqgi	d_gumlepvgmqdg	2	SCOPE	area	n_imcgrbkz	-	-	-
d_pdxazieddoep	d_nfvvsynsuqgi	1	NOP	-	-	-	-	p_qdggfdxg
d_flulkgesbefl	d_nfvvsynsuqgi	0	LET	-	-	x_a	7207	-
d_ojqpjszuogad	d_gumlepvgmqdg	0	LET	-	-	x_b	1898	-
d_igoqxcjvdfrk	d_gumlepvgmqdg	1	LET	-	-	x_a	9018	-
d_lxbyhxmlmxzv	d_gumlepvgmqdg	3	SCOPE	area	n_kamcsxht	-	-	-
d_ksmckctzaqsk	d_lxbyhxmlmxzv	1	SCOPE	func	n_iqloaety	-	-	-
d_gxxliwgbdsyd	d_ksmckctzaqsk	0	LET	-	-	x_a	7330	-
d_ptyrbyotvcja	d_lxbyhxmlmxzv	0	LET	-	-	x_a	8346	-
d_zijexbszbckb	d_lxbyhxmlmxzv	2	SCOPE	unit	n_zsweikhp	-	-	-
d_odtrqtqxjhfs	d_ksmckctzaqsk	1	NOP	-	-	-	-	p_eeughnii
d_qahetcbeqykm	d_zijexbszbckb	0	LET	-	-	x_a	5661	-
Program:
```

Raw answer:

```
fal x_a 5594
nezu n_sogvihzg
fal x_a 1099
kiv p_rzbpbpfy
wor
jomi n_hekhyacq
fal x_a 3863
nezu n_tsocmkmc
fal x_a 7286
jomi n_jpmxblkx
fal x_a 9924
sapu n_fcuiifcd
fal x_a 6555
kiv p_vdrvvmes
wor
jomi n_hryvqzqy
fal x_a 4232
jomi n_xnmbanvl
fal x_a 5391
jomi n_zhamktmu
fal x_a 5952
jomi n_jqfandro
fal x_a 6359
sapu n_zelwcebd
fal x_a 1781
wor
wor
wor
wor
wor
wor
```

**named_end**; trial `158effde616541a212442eaee90b0436ece1ed8f67ef7ddc520190204d4a6fc4`; outcome `correct`; gold `let x_a 1170
unit n_sjnmroae
let x_a 1652
nop p_dgccvdzu
end unit n_sjnmroae
unit n_fximebnq
let x_a 1004
func n_eyzjaoys
let x_a 4739
func n_gpyuwoqx
let x_a 5128
unit n_xjbbnhfy
let x_a 2901
unit n_obpwzpym
let x_a 2197
unit n_jzxrzucy
let x_a 8720
area n_fahfllyp
let x_a 8418
area n_graxnybu
let x_a 3134
nop p_fshbogyu
end area n_graxnybu
func n_dgcpqpqt
let x_a 3381
unit n_cocdilby
let x_a 4638
func n_oprrfape
let x_a 9512
func n_tbepeqed
let x_a 9132
func n_lbdqmkio
let x_a 8391
func n_orqxiluf
let x_a 6997
area n_ccmxdiyd
let x_a 2840
func n_snsomcpf
let x_a 3866
area n_nzdzjjcz
let x_a 9648
end area n_nzdzjjcz
end func n_snsomcpf
end area n_ccmxdiyd
end func n_orqxiluf
end func n_lbdqmkio
end func n_tbepeqed
end func n_oprrfape
end unit n_cocdilby
end func n_dgcpqpqt
end area n_fahfllyp
end unit n_jzxrzucy
end unit n_obpwzpym
end unit n_xjbbnhfy
end func n_gpyuwoqx
end func n_eyzjaoys
end unit n_fximebnq
`.

Input:

Full input: [failure-inputs/158effde616541a212442eaee90b0436ece1ed8f67ef7ddc520190204d4a6fc4.txt](failure-inputs/158effde616541a212442eaee90b0436ece1ed8f67ef7ddc520190204d4a6fc4.txt). Excerpt lines 1–40 of 423:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Translate the neutral AST table into a complete program in the following scope language.
Every block, regardless of its kind, creates a local scope.
ROOT is the implicit global scope and produces no source line. SCOPE opens a block and must be closed after its children.
LET binds its variable to its value. NOP produces a no-effect statement with its payload.
Each node's parent identifies its containing body. The order field gives the statement order within that body.
Rows are in parent-before-child order; their presentation order does not give statement order.
Node IDs are references for the table only and must not appear in source.
Use the grammar's keywords for the table's semantic kinds unit, func, and area.
Return only the complete program, without Markdown fences or explanation.

SYNTAX
The kind keywords are unit for unit, func for func, and area for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with end KIND NAME on one line. KIND and NAME must repeat that block's opening keyword and name.
KIND is one of unit, func, area; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is let VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is nop PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
AST table:
node	parent	order	tag	kind	name	variable	value	payload
d_gumlepvgmqdg	-	0	ROOT	-	-	-	-	-
d_nfvvsynsuqgi	d_gumlepvgmqdg	2	SCOPE	area	n_imcgrbkz	-	-	-
d_pdxazieddoep	d_nfvvsynsuqgi	1	NOP	-	-	-	-	p_qdggfdxg
d_flulkgesbefl	d_nfvvsynsuqgi	0	LET	-	-	x_a	7207	-
d_ojqpjszuogad	d_gumlepvgmqdg	0	LET	-	-	x_b	1898	-
d_igoqxcjvdfrk	d_gumlepvgmqdg	1	LET	-	-	x_a	9018	-
d_lxbyhxmlmxzv	d_gumlepvgmqdg	3	SCOPE	area	n_kamcsxht	-	-	-
d_ksmckctzaqsk	d_lxbyhxmlmxzv	1	SCOPE	func	n_iqloaety	-	-	-
d_gxxliwgbdsyd	d_ksmckctzaqsk	0	LET	-	-	x_a	7330	-
d_ptyrbyotvcja	d_lxbyhxmlmxzv	0	LET	-	-	x_a	8346	-
d_zijexbszbckb	d_lxbyhxmlmxzv	2	SCOPE	unit	n_zsweikhp	-	-	-
d_odtrqtqxjhfs	d_ksmckctzaqsk	1	NOP	-	-	-	-	p_eeughnii
d_qahetcbeqykm	d_zijexbszbckb	0	LET	-	-	x_a	5661	-
Program:
```

Raw answer:

```
let x_a 1170
unit n_sjnmroae
let x_a 1652
nop p_dgccvdzu
end unit n_sjnmroae
unit n_fximebnq
let x_a 1004
func n_eyzjaoys
let x_a 4739
func n_gpyuwoqx
let x_a 5128
unit n_xjbbnhfy
let x_a 2901
unit n_obpwzpym
let x_a 2197
unit n_jzxrzucy
let x_a 8720
area n_fahfllyp
let x_a 8418
area n_graxnybu
let x_a 3134
nop p_fshbogyu
end area n_graxnybu
func n_dgcpqpqt
let x_a 3381
unit n_cocdilby
let x_a 4638
func n_oprrfape
let x_a 9512
func n_tbepeqed
let x_a 9132
func n_lbdqmkio
let x_a 8391
func n_orqxiluf
let x_a 6997
area n_ccmxdiyd
let x_a 2840
func n_snsomcpf
let x_a 3866
area n_nzdzjjcz
let x_a 9648
end area n_nzdzjjcz
end func n_snsomcpf
end area n_ccmxdiyd
end func n_orqxiluf
end func n_lbdqmkio
end func n_tbepeqed
end func n_oprrfape
end unit n_cocdilby
end func n_dgcpqpqt
end area n_fahfllyp
end unit n_jzxrzucy
end unit n_obpwzpym
end unit n_xjbbnhfy
end func n_gpyuwoqx
end func n_eyzjaoys
end unit n_fximebnq
```

**generic_end**; trial `5352a6053abd4f6e879041134376d1f47a3bff568395d8e35bc11134351e9fc6`; outcome `invalid_generated_syntax`; gold `let x_a 1170
unit n_sjnmroae
let x_a 1652
nop p_dgccvdzu
end
unit n_fximebnq
let x_a 1004
func n_eyzjaoys
let x_a 4739
func n_gpyuwoqx
let x_a 5128
unit n_xjbbnhfy
let x_a 2901
unit n_obpwzpym
let x_a 2197
unit n_jzxrzucy
let x_a 8720
area n_fahfllyp
let x_a 8418
area n_graxnybu
let x_a 3134
nop p_fshbogyu
end
func n_dgcpqpqt
let x_a 3381
unit n_cocdilby
let x_a 4638
func n_oprrfape
let x_a 9512
func n_tbepeqed
let x_a 9132
func n_lbdqmkio
let x_a 8391
func n_orqxiluf
let x_a 6997
area n_ccmxdiyd
let x_a 2840
func n_snsomcpf
let x_a 3866
area n_nzdzjjcz
let x_a 9648
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
`.

Input:

Full input: [failure-inputs/5352a6053abd4f6e879041134376d1f47a3bff568395d8e35bc11134351e9fc6.txt](failure-inputs/5352a6053abd4f6e879041134376d1f47a3bff568395d8e35bc11134351e9fc6.txt). Excerpt lines 1–40 of 423:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Translate the neutral AST table into a complete program in the following scope language.
Every block, regardless of its kind, creates a local scope.
ROOT is the implicit global scope and produces no source line. SCOPE opens a block and must be closed after its children.
LET binds its variable to its value. NOP produces a no-effect statement with its payload.
Each node's parent identifies its containing body. The order field gives the statement order within that body.
Rows are in parent-before-child order; their presentation order does not give statement order.
Node IDs are references for the table only and must not appear in source.
Use the grammar's keywords for the table's semantic kinds unit, func, and area.
Return only the complete program, without Markdown fences or explanation.

SYNTAX
The kind keywords are unit for unit, func for func, and area for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with end on its own line.
KIND is one of unit, func, area; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is let VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is nop PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
AST table:
node	parent	order	tag	kind	name	variable	value	payload
d_gumlepvgmqdg	-	0	ROOT	-	-	-	-	-
d_nfvvsynsuqgi	d_gumlepvgmqdg	2	SCOPE	area	n_imcgrbkz	-	-	-
d_pdxazieddoep	d_nfvvsynsuqgi	1	NOP	-	-	-	-	p_qdggfdxg
d_flulkgesbefl	d_nfvvsynsuqgi	0	LET	-	-	x_a	7207	-
d_ojqpjszuogad	d_gumlepvgmqdg	0	LET	-	-	x_b	1898	-
d_igoqxcjvdfrk	d_gumlepvgmqdg	1	LET	-	-	x_a	9018	-
d_lxbyhxmlmxzv	d_gumlepvgmqdg	3	SCOPE	area	n_kamcsxht	-	-	-
d_ksmckctzaqsk	d_lxbyhxmlmxzv	1	SCOPE	func	n_iqloaety	-	-	-
d_gxxliwgbdsyd	d_ksmckctzaqsk	0	LET	-	-	x_a	7330	-
d_ptyrbyotvcja	d_lxbyhxmlmxzv	0	LET	-	-	x_a	8346	-
d_zijexbszbckb	d_lxbyhxmlmxzv	2	SCOPE	unit	n_zsweikhp	-	-	-
d_odtrqtqxjhfs	d_ksmckctzaqsk	1	NOP	-	-	-	-	p_eeughnii
d_qahetcbeqykm	d_zijexbszbckb	0	LET	-	-	x_a	5661	-
Program:
```

Raw answer:

```
let x_a 1170
unit n_sjnmroae
let x_a 1652
nop p_dgccvdzu
end
unit n_fximebnq
let x_a 1004
func n_eyzjaoys
let x_a 4739
func n_gpyuwoqx
let x_a 5128
unit n_xjbbnhfy
let x_a 2901
unit n_obpwzpym
let x_a 2197
unit n_jzxrzucy
let x_a 8720
area n_fahfllyp
let x_a 8418
area n_graxnybu
let x_a 3134
nop p_fshbogyu
end
func n_dgcpqpqt
let x_a 3381
unit n_cocdilby
let x_a 4638
func n_oprrfape
let x_a 9512
func n_tbepeqed
let x_a 9132
func n_lbdqmkio
let x_a 8391
func n_orqxiluf
let x_a 6997
area n_ccmxdiyd
let x_a 2840
func n_snsomcpf
let x_a 3866
area n_nzdzjjcz
let x_a 9648
end
end
end
end
end
end
end
end
end
end
end
```

**named_end**; trial `229cd742dcbc8a3fc6d8ef380b18c1522e3ceb795a0a848b9ac76a9a8e9b4e4e`; outcome `correct`; gold `fal x_a 1170
nezu n_sjnmroae
fal x_a 1652
kiv p_dgccvdzu
wor nezu n_sjnmroae
nezu n_fximebnq
fal x_a 1004
sapu n_eyzjaoys
fal x_a 4739
sapu n_gpyuwoqx
fal x_a 5128
nezu n_xjbbnhfy
fal x_a 2901
nezu n_obpwzpym
fal x_a 2197
nezu n_jzxrzucy
fal x_a 8720
jomi n_fahfllyp
fal x_a 8418
jomi n_graxnybu
fal x_a 3134
kiv p_fshbogyu
wor jomi n_graxnybu
sapu n_dgcpqpqt
fal x_a 3381
nezu n_cocdilby
fal x_a 4638
sapu n_oprrfape
fal x_a 9512
sapu n_tbepeqed
fal x_a 9132
sapu n_lbdqmkio
fal x_a 8391
sapu n_orqxiluf
fal x_a 6997
jomi n_ccmxdiyd
fal x_a 2840
sapu n_snsomcpf
fal x_a 3866
jomi n_nzdzjjcz
fal x_a 9648
wor jomi n_nzdzjjcz
wor sapu n_snsomcpf
wor jomi n_ccmxdiyd
wor sapu n_orqxiluf
wor sapu n_lbdqmkio
wor sapu n_tbepeqed
wor sapu n_oprrfape
wor nezu n_cocdilby
wor sapu n_dgcpqpqt
wor jomi n_fahfllyp
wor nezu n_jzxrzucy
wor nezu n_obpwzpym
wor nezu n_xjbbnhfy
wor sapu n_gpyuwoqx
wor sapu n_eyzjaoys
wor nezu n_fximebnq
`.

Input:

Full input: [failure-inputs/229cd742dcbc8a3fc6d8ef380b18c1522e3ceb795a0a848b9ac76a9a8e9b4e4e.txt](failure-inputs/229cd742dcbc8a3fc6d8ef380b18c1522e3ceb795a0a848b9ac76a9a8e9b4e4e.txt). Excerpt lines 1–40 of 423:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Translate the neutral AST table into a complete program in the following scope language.
Every block, regardless of its kind, creates a local scope.
ROOT is the implicit global scope and produces no source line. SCOPE opens a block and must be closed after its children.
LET binds its variable to its value. NOP produces a no-effect statement with its payload.
Each node's parent identifies its containing body. The order field gives the statement order within that body.
Rows are in parent-before-child order; their presentation order does not give statement order.
Node IDs are references for the table only and must not appear in source.
Use the grammar's keywords for the table's semantic kinds unit, func, and area.
Return only the complete program, without Markdown fences or explanation.

SYNTAX
The kind keywords are nezu for unit, sapu for func, and jomi for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with wor KIND NAME on one line. KIND and NAME must repeat that block's opening keyword and name.
KIND is one of nezu, sapu, jomi; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is fal VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is kiv PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
AST table:
node	parent	order	tag	kind	name	variable	value	payload
d_gumlepvgmqdg	-	0	ROOT	-	-	-	-	-
d_nfvvsynsuqgi	d_gumlepvgmqdg	2	SCOPE	area	n_imcgrbkz	-	-	-
d_pdxazieddoep	d_nfvvsynsuqgi	1	NOP	-	-	-	-	p_qdggfdxg
d_flulkgesbefl	d_nfvvsynsuqgi	0	LET	-	-	x_a	7207	-
d_ojqpjszuogad	d_gumlepvgmqdg	0	LET	-	-	x_b	1898	-
d_igoqxcjvdfrk	d_gumlepvgmqdg	1	LET	-	-	x_a	9018	-
d_lxbyhxmlmxzv	d_gumlepvgmqdg	3	SCOPE	area	n_kamcsxht	-	-	-
d_ksmckctzaqsk	d_lxbyhxmlmxzv	1	SCOPE	func	n_iqloaety	-	-	-
d_gxxliwgbdsyd	d_ksmckctzaqsk	0	LET	-	-	x_a	7330	-
d_ptyrbyotvcja	d_lxbyhxmlmxzv	0	LET	-	-	x_a	8346	-
d_zijexbszbckb	d_lxbyhxmlmxzv	2	SCOPE	unit	n_zsweikhp	-	-	-
d_odtrqtqxjhfs	d_ksmckctzaqsk	1	NOP	-	-	-	-	p_eeughnii
d_qahetcbeqykm	d_zijexbszbckb	0	LET	-	-	x_a	5661	-
Program:
```

Raw answer:

```
fal x_a 1170
nezu n_sjnmroae
fal x_a 1652
kiv p_dgccvdzu
wor nezu n_sjnmroae
nezu n_fximebnq
fal x_a 1004
sapu n_eyzjaoys
fal x_a 4739
sapu n_gpyuwoqx
fal x_a 5128
nezu n_xjbbnhfy
fal x_a 2901
nezu n_obpwzpym
fal x_a 2197
nezu n_jzxrzucy
fal x_a 8720
jomi n_fahfllyp
fal x_a 8418
jomi n_graxnybu
fal x_a 3134
kiv p_fshbogyu
wor jomi n_graxnybu
sapu n_dgcpqpqt
fal x_a 3381
nezu n_cocdilby
fal x_a 4638
sapu n_oprrfape
fal x_a 9512
sapu n_tbepeqed
fal x_a 9132
sapu n_lbdqmkio
fal x_a 8391
sapu n_orqxiluf
fal x_a 6997
jomi n_ccmxdiyd
fal x_a 2840
sapu n_snsomcpf
fal x_a 3866
jomi n_nzdzjjcz
fal x_a 9648
wor jomi n_nzdzjjcz
wor sapu n_snsomcpf
wor jomi n_ccmxdiyd
wor sapu n_orqxiluf
wor sapu n_lbdqmkio
wor sapu n_tbepeqed
wor sapu n_oprrfape
wor nezu n_cocdilby
wor sapu n_dgcpqpqt
wor jomi n_fahfllyp
wor nezu n_jzxrzucy
wor nezu n_obpwzpym
wor nezu n_xjbbnhfy
wor sapu n_gpyuwoqx
wor sapu n_eyzjaoys
wor nezu n_fximebnq
```

**generic_end**; trial `98340d7e5a8f65c549d76562fbccdb29396b2de756b5be143ac9e84df0db3231`; outcome `invalid_generated_syntax`; gold `fal x_a 1170
nezu n_sjnmroae
fal x_a 1652
kiv p_dgccvdzu
wor
nezu n_fximebnq
fal x_a 1004
sapu n_eyzjaoys
fal x_a 4739
sapu n_gpyuwoqx
fal x_a 5128
nezu n_xjbbnhfy
fal x_a 2901
nezu n_obpwzpym
fal x_a 2197
nezu n_jzxrzucy
fal x_a 8720
jomi n_fahfllyp
fal x_a 8418
jomi n_graxnybu
fal x_a 3134
kiv p_fshbogyu
wor
sapu n_dgcpqpqt
fal x_a 3381
nezu n_cocdilby
fal x_a 4638
sapu n_oprrfape
fal x_a 9512
sapu n_tbepeqed
fal x_a 9132
sapu n_lbdqmkio
fal x_a 8391
sapu n_orqxiluf
fal x_a 6997
jomi n_ccmxdiyd
fal x_a 2840
sapu n_snsomcpf
fal x_a 3866
jomi n_nzdzjjcz
fal x_a 9648
wor
wor
wor
wor
wor
wor
wor
wor
wor
wor
wor
wor
wor
wor
wor
wor
`.

Input:

Full input: [failure-inputs/98340d7e5a8f65c549d76562fbccdb29396b2de756b5be143ac9e84df0db3231.txt](failure-inputs/98340d7e5a8f65c549d76562fbccdb29396b2de756b5be143ac9e84df0db3231.txt). Excerpt lines 1–40 of 423:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Translate the neutral AST table into a complete program in the following scope language.
Every block, regardless of its kind, creates a local scope.
ROOT is the implicit global scope and produces no source line. SCOPE opens a block and must be closed after its children.
LET binds its variable to its value. NOP produces a no-effect statement with its payload.
Each node's parent identifies its containing body. The order field gives the statement order within that body.
Rows are in parent-before-child order; their presentation order does not give statement order.
Node IDs are references for the table only and must not appear in source.
Use the grammar's keywords for the table's semantic kinds unit, func, and area.
Return only the complete program, without Markdown fences or explanation.

SYNTAX
The kind keywords are nezu for unit, sapu for func, and jomi for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with wor on its own line.
KIND is one of nezu, sapu, jomi; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is fal VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is kiv PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
AST table:
node	parent	order	tag	kind	name	variable	value	payload
d_gumlepvgmqdg	-	0	ROOT	-	-	-	-	-
d_nfvvsynsuqgi	d_gumlepvgmqdg	2	SCOPE	area	n_imcgrbkz	-	-	-
d_pdxazieddoep	d_nfvvsynsuqgi	1	NOP	-	-	-	-	p_qdggfdxg
d_flulkgesbefl	d_nfvvsynsuqgi	0	LET	-	-	x_a	7207	-
d_ojqpjszuogad	d_gumlepvgmqdg	0	LET	-	-	x_b	1898	-
d_igoqxcjvdfrk	d_gumlepvgmqdg	1	LET	-	-	x_a	9018	-
d_lxbyhxmlmxzv	d_gumlepvgmqdg	3	SCOPE	area	n_kamcsxht	-	-	-
d_ksmckctzaqsk	d_lxbyhxmlmxzv	1	SCOPE	func	n_iqloaety	-	-	-
d_gxxliwgbdsyd	d_ksmckctzaqsk	0	LET	-	-	x_a	7330	-
d_ptyrbyotvcja	d_lxbyhxmlmxzv	0	LET	-	-	x_a	8346	-
d_zijexbszbckb	d_lxbyhxmlmxzv	2	SCOPE	unit	n_zsweikhp	-	-	-
d_odtrqtqxjhfs	d_ksmckctzaqsk	1	NOP	-	-	-	-	p_eeughnii
d_qahetcbeqykm	d_zijexbszbckb	0	LET	-	-	x_a	5661	-
Program:
```

Raw answer:

```
fal x_a 1170
nezu n_sjnmroae
fal x_a 1652
kiv p_dgccvdzu
wor
nezu n_fximebnq
fal x_a 1004
sapu n_eyzjaoys
fal x_a 4739
sapu n_gpyuwoqx
fal x_a 5128
nezu n_xjbbnhfy
fal x_a 2901
nezu n_obpwzpym
fal x_a 2197
nezu n_jzxrzucy
fal x_a 8720
jomi n_fahfllyp
fal x_a 8418
jomi n_graxnybu
fal x_a 3134
kiv p_fshbogyu
wor
sapu n_dgcpqpqt
fal x_a 3381
nezu n_cocdilby
fal x_a 4638
sapu n_oprrfape
fal x_a 9512
sapu n_tbepeqed
fal x_a 9132
sapu n_lbdqmkio
fal x_a 8391
sapu n_orqxiluf
fal x_a 6997
jomi n_ccmxdiyd
fal x_a 2840
sapu n_snsomcpf
fal x_a 3866
jomi n_nzdzjjcz
fal x_a 9648
wor
wor
wor
wor
wor
wor
wor
wor
wor
wor
wor
```

### D wrong / B correct

No eligible paired failures.

### both wrong

**named_end**; trial `3a77f2557d5234d0aa92835537bdce7fd8951baea5cdea9648bd1a469ebd0259`; outcome `valid_syntax_wrong_ast`; gold `let x_a 3279
func n_mzpsspvh
let x_a 1254
nop p_lrhbfobz
end func n_mzpsspvh
func n_ismslfyy
let x_a 8414
area n_bgdmguii
let x_a 7862
func n_dvyiccfq
let x_a 8970
unit n_zitnguuh
let x_a 1625
area n_ghvcshqb
let x_a 4318
area n_vcbtmlqa
let x_a 7684
area n_vllbudtu
let x_a 3768
func n_luxzitdh
let x_a 1588
nop p_unpegrif
end func n_luxzitdh
func n_gudoneas
area n_pvhvarxo
let x_a 2160
func n_bmqlilwc
let x_a 4183
area n_aaljyrxp
let x_a 8196
func n_hffrmitl
let x_a 3025
func n_kdzebvcm
let x_a 5239
area n_xdeckfky
let x_a 9199
unit n_zdjjkrph
let x_a 8914
area n_oquortib
let x_a 8761
nop p_zscswsyv
nop p_iqpqrbzb
nop p_nidyusof
nop p_ymfsviqc
nop p_yddwqqbu
nop p_qacumdxe
nop p_zeevhbwu
nop p_lsifyrwy
nop p_rcohdwxu
nop p_vrmsmceu
nop p_kwhkufxq
nop p_kazszxco
nop p_tskijdjs
nop p_fyxoosks
nop p_cmwuxyhw
nop p_inrcekgn
nop p_swosbztz
nop p_pkylpvhq
nop p_bdzhbveu
nop p_uldciykd
nop p_bpqrhmex
nop p_mehgnlwm
nop p_kodmgsox
nop p_aryqbmub
nop p_iccubeem
nop p_umidktsp
nop p_iwacoiso
nop p_wywrtuex
nop p_xfdvafnn
nop p_yjybalbk
nop p_xueuazsi
nop p_fkfhjoyj
end area n_oquortib
end unit n_zdjjkrph
end area n_xdeckfky
end func n_kdzebvcm
end func n_hffrmitl
end area n_aaljyrxp
end func n_bmqlilwc
end area n_pvhvarxo
end func n_gudoneas
end area n_vllbudtu
end area n_vcbtmlqa
end area n_ghvcshqb
end unit n_zitnguuh
end func n_dvyiccfq
end area n_bgdmguii
end func n_ismslfyy
`.

Input:

Full input: [failure-inputs/3a77f2557d5234d0aa92835537bdce7fd8951baea5cdea9648bd1a469ebd0259.txt](failure-inputs/3a77f2557d5234d0aa92835537bdce7fd8951baea5cdea9648bd1a469ebd0259.txt). Excerpt lines 1–40 of 454:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Translate the neutral AST table into a complete program in the following scope language.
Every block, regardless of its kind, creates a local scope.
ROOT is the implicit global scope and produces no source line. SCOPE opens a block and must be closed after its children.
LET binds its variable to its value. NOP produces a no-effect statement with its payload.
Each node's parent identifies its containing body. The order field gives the statement order within that body.
Rows are in parent-before-child order; their presentation order does not give statement order.
Node IDs are references for the table only and must not appear in source.
Use the grammar's keywords for the table's semantic kinds unit, func, and area.
Return only the complete program, without Markdown fences or explanation.

SYNTAX
The kind keywords are unit for unit, func for func, and area for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with end KIND NAME on one line. KIND and NAME must repeat that block's opening keyword and name.
KIND is one of unit, func, area; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is let VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is nop PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
AST table:
node	parent	order	tag	kind	name	variable	value	payload
d_gumlepvgmqdg	-	0	ROOT	-	-	-	-	-
d_nfvvsynsuqgi	d_gumlepvgmqdg	2	SCOPE	area	n_imcgrbkz	-	-	-
d_pdxazieddoep	d_nfvvsynsuqgi	1	NOP	-	-	-	-	p_qdggfdxg
d_flulkgesbefl	d_nfvvsynsuqgi	0	LET	-	-	x_a	7207	-
d_ojqpjszuogad	d_gumlepvgmqdg	0	LET	-	-	x_b	1898	-
d_igoqxcjvdfrk	d_gumlepvgmqdg	1	LET	-	-	x_a	9018	-
d_lxbyhxmlmxzv	d_gumlepvgmqdg	3	SCOPE	area	n_kamcsxht	-	-	-
d_ksmckctzaqsk	d_lxbyhxmlmxzv	1	SCOPE	func	n_iqloaety	-	-	-
d_gxxliwgbdsyd	d_ksmckctzaqsk	0	LET	-	-	x_a	7330	-
d_ptyrbyotvcja	d_lxbyhxmlmxzv	0	LET	-	-	x_a	8346	-
d_zijexbszbckb	d_lxbyhxmlmxzv	2	SCOPE	unit	n_zsweikhp	-	-	-
d_odtrqtqxjhfs	d_ksmckctzaqsk	1	NOP	-	-	-	-	p_eeughnii
d_qahetcbeqykm	d_zijexbszbckb	0	LET	-	-	x_a	5661	-
Program:
```

Raw answer:

```
let x_a 3279
func n_mzpsspvh
let x_a 1254
nop p_lrhbfobz
end func n_mzpsspvh
func n_ismslfyy
let x_a 8414
area n_bgdmguii
let x_a 7862
func n_dvyiccfq
let x_a 8970
unit n_zitnguuh
let x_a 1625
area n_ghvcshqb
let x_a 4318
area n_vcbtmlqa
let x_a 7684
func n_luxzitdh
let x_a 1588
nop p_unpegrif
end func n_luxzitdh
area n_vllbudtu
let x_a 3768
func n_gudoneas
area n_pvhvarxo
let x_a 2160
func n_bmqlilwc
let x_a 4183
area n_aaljyrxp
let x_a 8196
func n_hffrmitl
let x_a 3025
func n_kdzebvcm
let x_a 5239
area n_xdeckfky
let x_a 9199
unit n_zdjjkrph
let x_a 8914
area n_oquortib
let x_a 8761
nop p_zscswsyv
nop p_iqpqrbzb
nop p_nidyusof
nop p_ymfsviqc
nop p_yddwqqbu
nop p_qacumdxe
nop p_zeevhbwu
nop p_lsifyrwy
nop p_rcohdwxu
nop p_vrmsmceu
nop p_kwhkufxq
nop p_kazszxco
nop p_tskijdjs
nop p_fyxoosks
nop p_cmwuxyhw
nop p_inrcekgn
nop p_swosbztz
nop p_pkylpvhq
nop p_bdzhbveu
nop p_uldciykd
nop p_bpqrhmex
nop p_mehgnlwm
nop p_kodmgsox
nop p_aryqbmub
nop p_iccubeem
nop p_umidktsp
nop p_iwacoiso
nop p_wywrtuex
nop p_xfdvafnn
nop p_yjybalbk
nop p_xueuazsi
nop p_fkfhjoyj
end area n_oquortib
end unit n_zdjjkrph
end area n_xdeckfky
end func n_kdzebvcm
end func n_hffrmitl
end area n_aaljyrxp
end func n_bmqlilwc
end area n_pvhvarxo
end func n_gudoneas
end area n_vllbudtu
end area n_vcbtmlqa
end area n_ghvcshqb
end unit n_zitnguuh
end func n_dvyiccfq
end area n_bgdmguii
end func n_ismslfyy
```

**generic_end**; trial `a58755f9c20f2df98c27fa9327452aa8332a4e116b99f6a32b222f73349cc5a6`; outcome `invalid_generated_syntax`; gold `let x_a 3279
func n_mzpsspvh
let x_a 1254
nop p_lrhbfobz
end
func n_ismslfyy
let x_a 8414
area n_bgdmguii
let x_a 7862
func n_dvyiccfq
let x_a 8970
unit n_zitnguuh
let x_a 1625
area n_ghvcshqb
let x_a 4318
area n_vcbtmlqa
let x_a 7684
area n_vllbudtu
let x_a 3768
func n_luxzitdh
let x_a 1588
nop p_unpegrif
end
func n_gudoneas
area n_pvhvarxo
let x_a 2160
func n_bmqlilwc
let x_a 4183
area n_aaljyrxp
let x_a 8196
func n_hffrmitl
let x_a 3025
func n_kdzebvcm
let x_a 5239
area n_xdeckfky
let x_a 9199
unit n_zdjjkrph
let x_a 8914
area n_oquortib
let x_a 8761
nop p_zscswsyv
nop p_iqpqrbzb
nop p_nidyusof
nop p_ymfsviqc
nop p_yddwqqbu
nop p_qacumdxe
nop p_zeevhbwu
nop p_lsifyrwy
nop p_rcohdwxu
nop p_vrmsmceu
nop p_kwhkufxq
nop p_kazszxco
nop p_tskijdjs
nop p_fyxoosks
nop p_cmwuxyhw
nop p_inrcekgn
nop p_swosbztz
nop p_pkylpvhq
nop p_bdzhbveu
nop p_uldciykd
nop p_bpqrhmex
nop p_mehgnlwm
nop p_kodmgsox
nop p_aryqbmub
nop p_iccubeem
nop p_umidktsp
nop p_iwacoiso
nop p_wywrtuex
nop p_xfdvafnn
nop p_yjybalbk
nop p_xueuazsi
nop p_fkfhjoyj
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
`.

Input:

Full input: [failure-inputs/a58755f9c20f2df98c27fa9327452aa8332a4e116b99f6a32b222f73349cc5a6.txt](failure-inputs/a58755f9c20f2df98c27fa9327452aa8332a4e116b99f6a32b222f73349cc5a6.txt). Excerpt lines 1–40 of 454:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Translate the neutral AST table into a complete program in the following scope language.
Every block, regardless of its kind, creates a local scope.
ROOT is the implicit global scope and produces no source line. SCOPE opens a block and must be closed after its children.
LET binds its variable to its value. NOP produces a no-effect statement with its payload.
Each node's parent identifies its containing body. The order field gives the statement order within that body.
Rows are in parent-before-child order; their presentation order does not give statement order.
Node IDs are references for the table only and must not appear in source.
Use the grammar's keywords for the table's semantic kinds unit, func, and area.
Return only the complete program, without Markdown fences or explanation.

SYNTAX
The kind keywords are unit for unit, func for func, and area for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with end on its own line.
KIND is one of unit, func, area; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is let VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is nop PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
AST table:
node	parent	order	tag	kind	name	variable	value	payload
d_gumlepvgmqdg	-	0	ROOT	-	-	-	-	-
d_nfvvsynsuqgi	d_gumlepvgmqdg	2	SCOPE	area	n_imcgrbkz	-	-	-
d_pdxazieddoep	d_nfvvsynsuqgi	1	NOP	-	-	-	-	p_qdggfdxg
d_flulkgesbefl	d_nfvvsynsuqgi	0	LET	-	-	x_a	7207	-
d_ojqpjszuogad	d_gumlepvgmqdg	0	LET	-	-	x_b	1898	-
d_igoqxcjvdfrk	d_gumlepvgmqdg	1	LET	-	-	x_a	9018	-
d_lxbyhxmlmxzv	d_gumlepvgmqdg	3	SCOPE	area	n_kamcsxht	-	-	-
d_ksmckctzaqsk	d_lxbyhxmlmxzv	1	SCOPE	func	n_iqloaety	-	-	-
d_gxxliwgbdsyd	d_ksmckctzaqsk	0	LET	-	-	x_a	7330	-
d_ptyrbyotvcja	d_lxbyhxmlmxzv	0	LET	-	-	x_a	8346	-
d_zijexbszbckb	d_lxbyhxmlmxzv	2	SCOPE	unit	n_zsweikhp	-	-	-
d_odtrqtqxjhfs	d_ksmckctzaqsk	1	NOP	-	-	-	-	p_eeughnii
d_qahetcbeqykm	d_zijexbszbckb	0	LET	-	-	x_a	5661	-
Program:
```

Raw answer:

```
let x_a 3279
func n_mzpsspvh
let x_a 1254
nop p_lrhbfobz
end
func n_ismslfyy
let x_a 8414
area n_bgdmguii
let x_a 7862
func n_dvyiccfq
let x_a 8970
unit n_zitnguuh
let x_a 1625
area n_ghvcshqb
let x_a 4318
area n_vcbtmlqa
let x_a 7684
area n_vllbudtu
let x_a 3768
func n_luxzitdh
let x_a 1588
nop p_unpegrif
end
func n_gudoneas
area n_pvhvarxo
let x_a 2160
func n_bmqlilwc
let x_a 4183
area n_aaljyrxp
let x_a 8196
func n_hffrmitl
let x_a 3025
func n_kdzebvcm
let x_a 5239
area n_xdeckfky
let x_a 9199
unit n_zdjjkrph
let x_a 8914
area n_oquortib
let x_a 8761
nop p_zscswsyv
nop p_iqpqrbzb
nop p_nidyusof
nop p_ymfsviqc
nop p_yddwqqbu
nop p_qacumdxe
nop p_zeevhbwu
nop p_lsifyrwy
nop p_rcohdwxu
nop p_vrmsmceu
nop p_kwhkufxq
nop p_kazszxco
nop p_tskijdjs
nop p_fyxoosks
nop p_cmwuxyhw
nop p_inrcekgn
nop p_swosbztz
nop p_pkylpvhq
nop p_bdzhbveu
nop p_uldciykd
nop p_bpqrhmex
nop p_mehgnlwm
nop p_kodmgsox
nop p_aryqbmub
nop p_iccubeem
nop p_umidktsp
nop p_iwacoiso
nop p_wywrtuex
nop p_xfdvafnn
nop p_yjybalbk
nop p_xueuazsi
nop p_fkfhjoyj
end
end
end
end
end
end
end
end
end
end
end
end
```

### source_to_ast

### D correct / B wrong

**named_end**; trial `03c7b68fea90273f64ab0af379a9d676913ef670bb4a5f8e03bfe3f0cfcb3ff9`; outcome `correct`; gold `{"body":[{"type":"let","value":2725,"variable":"x_a"},{"body":[{"type":"let","value":5588,"variable":"x_a"},{"payload":"p_pjftmthz","type":"nop"}],"kind":"func","name":"n_ryelfrgz","type":"scope"},{"body":[{"type":"let","value":9164,"variable":"x_a"},{"body":[{"type":"let","value":4772,"variable":"x_a"},{"body":[{"type":"let","value":5037,"variable":"x_a"},{"body":[{"type":"let","value":8114,"variable":"x_a"},{"body":[{"type":"let","value":3147,"variable":"x_a"},{"body":[{"type":"let","value":6863,"variable":"x_a"},{"body":[{"type":"let","value":6496,"variable":"x_a"},{"body":[{"type":"let","value":2398,"variable":"x_a"},{"payload":"p_vgttvvmg","type":"nop"}],"kind":"area","name":"n_gkalocya","type":"scope"},{"body":[{"type":"let","value":4116,"variable":"x_a"},{"body":[{"type":"let","value":4082,"variable":"x_a"},{"body":[{"type":"let","value":5557,"variable":"x_a"},{"body":[{"type":"let","value":7274,"variable":"x_a"},{"body":[{"type":"let","value":9614,"variable":"x_a"},{"body":[{"type":"let","value":5102,"variable":"x_a"},{"body":[{"type":"let","value":8719,"variable":"x_a"},{"body":[{"type":"let","value":2976,"variable":"x_a"},{"body":[{"type":"let","value":1956,"variable":"x_a"}],"kind":"func","name":"n_fmfpbonh","type":"scope"}],"kind":"unit","name":"n_icevqcas","type":"scope"}],"kind":"area","name":"n_kxyotvqf","type":"scope"}],"kind":"unit","name":"n_lsmjtmen","type":"scope"}],"kind":"area","name":"n_eiwfauwh","type":"scope"}],"kind":"area","name":"n_zgctandu","type":"scope"}],"kind":"area","name":"n_zyqvydua","type":"scope"}],"kind":"func","name":"n_cfhasprv","type":"scope"}],"kind":"unit","name":"n_oniolhzt","type":"scope"}],"kind":"unit","name":"n_qeueswtm","type":"scope"}],"kind":"func","name":"n_kovictja","type":"scope"}],"kind":"unit","name":"n_lnlbclpi","type":"scope"}],"kind":"unit","name":"n_kjnzhlal","type":"scope"}],"kind":"unit","name":"n_vlenwxze","type":"scope"}],"kind":"area","name":"n_sbbhrsuy","type":"scope"}],"kind":"area","name":"n_fccexvtt","type":"scope"}]}`.

Input:

Full input: [failure-inputs/03c7b68fea90273f64ab0af379a9d676913ef670bb4a5f8e03bfe3f0cfcb3ff9.txt](failure-inputs/03c7b68fea90273f64ab0af379a9d676913ef670bb4a5f8e03bfe3f0cfcb3ff9.txt). Excerpt lines 1–40 of 300:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Parse the complete program into its neutral JSON abstract syntax tree.
Preserve every node, parent-child relationship, statement order, scope kind and name, variable and value, and nop payload.
Do not evaluate bindings or discard shadowed bindings or nop statements.
The root is a JSON object with exactly one field, body, containing an ordered array of statements.
A scope node has exactly these fields: {"type":"scope","kind":"func","name":"n_abcdefgh","body":[]}.
Its kind is the semantic category unit, func, or area, using the mapping in SYNTAX even when the input keywords differ.
A binding node has exactly these fields: {"type":"let","variable":"x_a","value":1739}.
A nop node has exactly these fields: {"type":"nop","payload":"p_abcdefgh"}.
Use the actual names, variables, integer values and payloads from the input, not these illustrative schema values.
Closing lines determine the end of a scope body and do not create AST nodes.
Object field order and whitespace may vary; body-array order must match the source statement order.
Return only the complete JSON AST, without Markdown fences or explanation.

SYNTAX
The kind keywords are unit for unit, func for func, and area for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with end KIND NAME on one line. KIND and NAME must repeat that block's opening keyword and name.
KIND is one of unit, func, area; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is let VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is nop PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
Program:
let x_b 1898
let x_a 9018
area n_imcgrbkz
let x_a 7207
nop p_qdggfdxg
end area n_imcgrbkz
area n_kamcsxht
let x_a 8346
func n_iqloaety
let x_a 7330
nop p_eeughnii
end func n_iqloaety
```

Raw answer:

```
{"body":[{"type":"let","variable":"x_a","value":2725},{"type":"scope","kind":"func","name":"n_ryelfrgz","body":[{"type":"let","variable":"x_a","value":5588},{"type":"nop","payload":"p_pjftmthz"}]},{"type":"scope","kind":"area","name":"n_fccexvtt","body":[{"type":"let","variable":"x_a","value":9164},{"type":"scope","kind":"area","name":"n_sbbhrsuy","body":[{"type":"let","variable":"x_a","value":4772},{"type":"scope","kind":"unit","name":"n_vlenwxze","body":[{"type":"let","variable":"x_a","value":5037},{"type":"scope","kind":"unit","name":"n_kjnzhlal","body":[{"type":"let","variable":"x_a","value":8114},{"type":"scope","kind":"unit","name":"n_lnlbclpi","body":[{"type":"let","variable":"x_a","value":3147},{"type":"scope","kind":"func","name":"n_kovictja","body":[{"type":"let","variable":"x_a","value":6863},{"type":"scope","kind":"unit","name":"n_qeueswtm","body":[{"type":"let","variable":"x_a","value":6496},{"type":"scope","kind":"area","name":"n_gkalocya","body":[{"type":"let","variable":"x_a","value":2398},{"type":"nop","payload":"p_vgttvvmg"}]},{"type":"scope","kind":"unit","name":"n_oniolhzt","body":[{"type":"let","variable":"x_a","value":4116},{"type":"scope","kind":"func","name":"n_cfhasprv","body":[{"type":"let","variable":"x_a","value":4082},{"type":"scope","kind":"area","name":"n_zyqvydua","body":[{"type":"let","variable":"x_a","value":5557},{"type":"scope","kind":"area","name":"n_zgctandu","body":[{"type":"let","variable":"x_a","value":7274},{"type":"scope","kind":"area","name":"n_eiwfauwh","body":[{"type":"let","variable":"x_a","value":9614},{"type":"scope","kind":"unit","name":"n_lsmjtmen","body":[{"type":"let","variable":"x_a","value":5102},{"type":"scope","kind":"area","name":"n_kxyotvqf","body":[{"type":"let","variable":"x_a","value":8719},{"type":"scope","kind":"unit","name":"n_icevqcas","body":[{"type":"let","variable":"x_a","value":2976},{"type":"scope","kind":"func","name":"n_fmfpbonh","body":[{"type":"let","variable":"x_a","value":1956}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}
```

**generic_end**; trial `de39d64425228f5cc4ec45b059be9650b95b2e606ab0fb0e040f924f521ea144`; outcome `invalid_answer_format`; gold `{"body":[{"type":"let","value":2725,"variable":"x_a"},{"body":[{"type":"let","value":5588,"variable":"x_a"},{"payload":"p_pjftmthz","type":"nop"}],"kind":"func","name":"n_ryelfrgz","type":"scope"},{"body":[{"type":"let","value":9164,"variable":"x_a"},{"body":[{"type":"let","value":4772,"variable":"x_a"},{"body":[{"type":"let","value":5037,"variable":"x_a"},{"body":[{"type":"let","value":8114,"variable":"x_a"},{"body":[{"type":"let","value":3147,"variable":"x_a"},{"body":[{"type":"let","value":6863,"variable":"x_a"},{"body":[{"type":"let","value":6496,"variable":"x_a"},{"body":[{"type":"let","value":2398,"variable":"x_a"},{"payload":"p_vgttvvmg","type":"nop"}],"kind":"area","name":"n_gkalocya","type":"scope"},{"body":[{"type":"let","value":4116,"variable":"x_a"},{"body":[{"type":"let","value":4082,"variable":"x_a"},{"body":[{"type":"let","value":5557,"variable":"x_a"},{"body":[{"type":"let","value":7274,"variable":"x_a"},{"body":[{"type":"let","value":9614,"variable":"x_a"},{"body":[{"type":"let","value":5102,"variable":"x_a"},{"body":[{"type":"let","value":8719,"variable":"x_a"},{"body":[{"type":"let","value":2976,"variable":"x_a"},{"body":[{"type":"let","value":1956,"variable":"x_a"}],"kind":"func","name":"n_fmfpbonh","type":"scope"}],"kind":"unit","name":"n_icevqcas","type":"scope"}],"kind":"area","name":"n_kxyotvqf","type":"scope"}],"kind":"unit","name":"n_lsmjtmen","type":"scope"}],"kind":"area","name":"n_eiwfauwh","type":"scope"}],"kind":"area","name":"n_zgctandu","type":"scope"}],"kind":"area","name":"n_zyqvydua","type":"scope"}],"kind":"func","name":"n_cfhasprv","type":"scope"}],"kind":"unit","name":"n_oniolhzt","type":"scope"}],"kind":"unit","name":"n_qeueswtm","type":"scope"}],"kind":"func","name":"n_kovictja","type":"scope"}],"kind":"unit","name":"n_lnlbclpi","type":"scope"}],"kind":"unit","name":"n_kjnzhlal","type":"scope"}],"kind":"unit","name":"n_vlenwxze","type":"scope"}],"kind":"area","name":"n_sbbhrsuy","type":"scope"}],"kind":"area","name":"n_fccexvtt","type":"scope"}]}`.

AST diagnostics: ast_error_code=invalid_json, ast_error_path=$.

Input:

Full input: [failure-inputs/de39d64425228f5cc4ec45b059be9650b95b2e606ab0fb0e040f924f521ea144.txt](failure-inputs/de39d64425228f5cc4ec45b059be9650b95b2e606ab0fb0e040f924f521ea144.txt). Excerpt lines 1–40 of 300:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Parse the complete program into its neutral JSON abstract syntax tree.
Preserve every node, parent-child relationship, statement order, scope kind and name, variable and value, and nop payload.
Do not evaluate bindings or discard shadowed bindings or nop statements.
The root is a JSON object with exactly one field, body, containing an ordered array of statements.
A scope node has exactly these fields: {"type":"scope","kind":"func","name":"n_abcdefgh","body":[]}.
Its kind is the semantic category unit, func, or area, using the mapping in SYNTAX even when the input keywords differ.
A binding node has exactly these fields: {"type":"let","variable":"x_a","value":1739}.
A nop node has exactly these fields: {"type":"nop","payload":"p_abcdefgh"}.
Use the actual names, variables, integer values and payloads from the input, not these illustrative schema values.
Closing lines determine the end of a scope body and do not create AST nodes.
Object field order and whitespace may vary; body-array order must match the source statement order.
Return only the complete JSON AST, without Markdown fences or explanation.

SYNTAX
The kind keywords are unit for unit, func for func, and area for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with end on its own line.
KIND is one of unit, func, area; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is let VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is nop PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
Program:
let x_b 1898
let x_a 9018
area n_imcgrbkz
let x_a 7207
nop p_qdggfdxg
end
area n_kamcsxht
let x_a 8346
func n_iqloaety
let x_a 7330
nop p_eeughnii
end
```

Raw answer:

```
{"body":[{"type":"let","variable":"x_a","value":2725},{"type":"scope","kind":"func","name":"n_ryelfrgz","body":[{"type":"let","variable":"x_a","value":5588},{"type":"nop","payload":"p_pjftmthz"}]},{"type":"scope","kind":"area","name":"n_fccexvtt","body":[{"type":"let","variable":"x_a","value":9164},{"type":"scope","kind":"area","name":"n_sbbhrsuy","body":[{"type":"let","variable":"x_a","value":4772},{"type":"scope","kind":"unit","name":"n_vlenwxze","body":[{"type":"let","variable":"x_a","value":5037},{"type":"scope","kind":"unit","name":"n_kjnzhlal","body":[{"type":"let","variable":"x_a","value":8114},{"type":"scope","kind":"unit","name":"n_lnlbclpi","body":[{"type":"let","variable":"x_a","value":3147},{"type":"scope","kind":"func","name":"n_kovictja","body":[{"type":"let","variable":"x_a","value":6863},{"type":"scope","kind":"unit","name":"n_qeueswtm","body":[{"type":"let","variable":"x_a","value":6496},{"type":"scope","kind":"area","name":"n_gkalocya","body":[{"type":"let","variable":"x_a","value":2398},{"type":"nop","payload":"p_vgttvvmg"}]},{"type":"scope","kind":"unit","name":"n_oniolhzt","body":[{"type":"let","variable":"x_a","value":4116},{"type":"scope","kind":"func","name":"n_cfhasprv","body":[{"type":"let","variable":"x_a","value":4082},{"type":"scope","kind":"area","name":"n_zyqvydua","body":[{"type":"let","variable":"x_a","value":5557},{"type":"scope","kind":"area","name":"n_zgctandu","body":[{"type":"let","variable":"x_a","value":7274},{"type":"scope","kind":"area","name":"n_eiwfauwh","body":[{"type":"let","variable":"x_a","value":9614},{"type":"scope","kind":"unit","name":"n_lsmjtmen","body":[{"type":"let","variable":"x_a","value":5102},{"type":"scope","kind":"area","name":"n_kxyotvqf","body":[{"type":"let","variable":"x_a","value":8719},{"type":"scope","kind":"unit","name":"n_icevqcas","body":[{"type":"let","variable":"x_a","value":2976},{"type":"scope","kind":"func","name":"n_fmfpbonh","body":[{"type":"let","variable":"x_a","value":1956}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}
```

**named_end**; trial `0ae41cea4cd2971ac1e5d9434e080e96cd59f6a1ed726ed3a69de80cf5946f87`; outcome `correct`; gold `{"body":[{"type":"let","value":5594,"variable":"x_a"},{"body":[{"type":"let","value":1099,"variable":"x_a"},{"payload":"p_rzbpbpfy","type":"nop"}],"kind":"unit","name":"n_sogvihzg","type":"scope"},{"body":[{"type":"let","value":3863,"variable":"x_a"},{"body":[{"type":"let","value":7286,"variable":"x_a"},{"body":[{"type":"let","value":9924,"variable":"x_a"},{"body":[{"type":"let","value":6555,"variable":"x_a"},{"payload":"p_vdrvvmes","type":"nop"}],"kind":"func","name":"n_fcuiifcd","type":"scope"},{"body":[{"type":"let","value":4232,"variable":"x_a"},{"body":[{"type":"let","value":5391,"variable":"x_a"},{"body":[{"type":"let","value":5952,"variable":"x_a"},{"body":[{"type":"let","value":6359,"variable":"x_a"},{"body":[{"type":"let","value":1781,"variable":"x_a"}],"kind":"func","name":"n_zelwcebd","type":"scope"}],"kind":"area","name":"n_jqfandro","type":"scope"}],"kind":"area","name":"n_zhamktmu","type":"scope"}],"kind":"area","name":"n_xnmbanvl","type":"scope"}],"kind":"area","name":"n_hryvqzqy","type":"scope"}],"kind":"area","name":"n_jpmxblkx","type":"scope"}],"kind":"unit","name":"n_tsocmkmc","type":"scope"}],"kind":"area","name":"n_hekhyacq","type":"scope"}]}`.

Input:

Full input: [failure-inputs/0ae41cea4cd2971ac1e5d9434e080e96cd59f6a1ed726ed3a69de80cf5946f87.txt](failure-inputs/0ae41cea4cd2971ac1e5d9434e080e96cd59f6a1ed726ed3a69de80cf5946f87.txt). Excerpt lines 1–40 of 276:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Parse the complete program into its neutral JSON abstract syntax tree.
Preserve every node, parent-child relationship, statement order, scope kind and name, variable and value, and nop payload.
Do not evaluate bindings or discard shadowed bindings or nop statements.
The root is a JSON object with exactly one field, body, containing an ordered array of statements.
A scope node has exactly these fields: {"type":"scope","kind":"func","name":"n_abcdefgh","body":[]}.
Its kind is the semantic category unit, func, or area, using the mapping in SYNTAX even when the input keywords differ.
A binding node has exactly these fields: {"type":"let","variable":"x_a","value":1739}.
A nop node has exactly these fields: {"type":"nop","payload":"p_abcdefgh"}.
Use the actual names, variables, integer values and payloads from the input, not these illustrative schema values.
Closing lines determine the end of a scope body and do not create AST nodes.
Object field order and whitespace may vary; body-array order must match the source statement order.
Return only the complete JSON AST, without Markdown fences or explanation.

SYNTAX
The kind keywords are unit for unit, func for func, and area for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with end KIND NAME on one line. KIND and NAME must repeat that block's opening keyword and name.
KIND is one of unit, func, area; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is let VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is nop PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
Program:
let x_b 1898
let x_a 9018
area n_imcgrbkz
let x_a 7207
nop p_qdggfdxg
end area n_imcgrbkz
area n_kamcsxht
let x_a 8346
func n_iqloaety
let x_a 7330
nop p_eeughnii
end func n_iqloaety
```

Raw answer:

```
{"body":[{"type":"let","variable":"x_a","value":5594},{"type":"scope","kind":"unit","name":"n_sogvihzg","body":[{"type":"let","variable":"x_a","value":1099},{"type":"nop","payload":"p_rzbpbpfy"}]},{"type":"scope","kind":"area","name":"n_hekhyacq","body":[{"type":"let","variable":"x_a","value":3863},{"type":"scope","kind":"unit","name":"n_tsocmkmc","body":[{"type":"let","variable":"x_a","value":7286},{"type":"scope","kind":"area","name":"n_jpmxblkx","body":[{"type":"let","variable":"x_a","value":9924},{"type":"scope","kind":"func","name":"n_fcuiifcd","body":[{"type":"let","variable":"x_a","value":6555},{"type":"nop","payload":"p_vdrvvmes"}]},{"type":"scope","kind":"area","name":"n_hryvqzqy","body":[{"type":"let","variable":"x_a","value":4232},{"type":"scope","kind":"area","name":"n_xnmbanvl","body":[{"type":"let","variable":"x_a","value":5391},{"type":"scope","kind":"area","name":"n_zhamktmu","body":[{"type":"let","variable":"x_a","value":5952},{"type":"scope","kind":"area","name":"n_jqfandro","body":[{"type":"let","variable":"x_a","value":6359},{"type":"scope","kind":"func","name":"n_zelwcebd","body":[{"type":"let","variable":"x_a","value":1781}]}]}]}]}]}]}]}]}]}
```

**generic_end**; trial `f08336870e1df926099864f10fb21b3c08db5e2704848bf7ba3142b607f13507`; outcome `invalid_answer_format`; gold `{"body":[{"type":"let","value":5594,"variable":"x_a"},{"body":[{"type":"let","value":1099,"variable":"x_a"},{"payload":"p_rzbpbpfy","type":"nop"}],"kind":"unit","name":"n_sogvihzg","type":"scope"},{"body":[{"type":"let","value":3863,"variable":"x_a"},{"body":[{"type":"let","value":7286,"variable":"x_a"},{"body":[{"type":"let","value":9924,"variable":"x_a"},{"body":[{"type":"let","value":6555,"variable":"x_a"},{"payload":"p_vdrvvmes","type":"nop"}],"kind":"func","name":"n_fcuiifcd","type":"scope"},{"body":[{"type":"let","value":4232,"variable":"x_a"},{"body":[{"type":"let","value":5391,"variable":"x_a"},{"body":[{"type":"let","value":5952,"variable":"x_a"},{"body":[{"type":"let","value":6359,"variable":"x_a"},{"body":[{"type":"let","value":1781,"variable":"x_a"}],"kind":"func","name":"n_zelwcebd","type":"scope"}],"kind":"area","name":"n_jqfandro","type":"scope"}],"kind":"area","name":"n_zhamktmu","type":"scope"}],"kind":"area","name":"n_xnmbanvl","type":"scope"}],"kind":"area","name":"n_hryvqzqy","type":"scope"}],"kind":"area","name":"n_jpmxblkx","type":"scope"}],"kind":"unit","name":"n_tsocmkmc","type":"scope"}],"kind":"area","name":"n_hekhyacq","type":"scope"}]}`.

AST diagnostics: ast_error_code=invalid_json, ast_error_path=$.

Input:

Full input: [failure-inputs/f08336870e1df926099864f10fb21b3c08db5e2704848bf7ba3142b607f13507.txt](failure-inputs/f08336870e1df926099864f10fb21b3c08db5e2704848bf7ba3142b607f13507.txt). Excerpt lines 1–40 of 276:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Parse the complete program into its neutral JSON abstract syntax tree.
Preserve every node, parent-child relationship, statement order, scope kind and name, variable and value, and nop payload.
Do not evaluate bindings or discard shadowed bindings or nop statements.
The root is a JSON object with exactly one field, body, containing an ordered array of statements.
A scope node has exactly these fields: {"type":"scope","kind":"func","name":"n_abcdefgh","body":[]}.
Its kind is the semantic category unit, func, or area, using the mapping in SYNTAX even when the input keywords differ.
A binding node has exactly these fields: {"type":"let","variable":"x_a","value":1739}.
A nop node has exactly these fields: {"type":"nop","payload":"p_abcdefgh"}.
Use the actual names, variables, integer values and payloads from the input, not these illustrative schema values.
Closing lines determine the end of a scope body and do not create AST nodes.
Object field order and whitespace may vary; body-array order must match the source statement order.
Return only the complete JSON AST, without Markdown fences or explanation.

SYNTAX
The kind keywords are unit for unit, func for func, and area for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with end on its own line.
KIND is one of unit, func, area; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is let VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is nop PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
Program:
let x_b 1898
let x_a 9018
area n_imcgrbkz
let x_a 7207
nop p_qdggfdxg
end
area n_kamcsxht
let x_a 8346
func n_iqloaety
let x_a 7330
nop p_eeughnii
end
```

Raw answer:

```
{"body":[{"type":"let","variable":"x_a","value":5594},{"type":"scope","kind":"unit","name":"n_sogvihzg","body":[{"type":"let","variable":"x_a","value":1099},{"type":"nop","payload":"p_rzbpbpfy"}]},{"type":"scope","kind":"area","name":"n_hekhyacq","body":[{"type":"let","variable":"x_a","value":3863},{"type":"scope","kind":"unit","name":"n_tsocmkmc","body":[{"type":"let","variable":"x_a","value":7286},{"type":"scope","kind":"area","name":"n_jpmxblkx","body":[{"type":"let","variable":"x_a","value":9924},{"type":"scope","kind":"func","name":"n_fcuiifcd","body":[{"type":"let","variable":"x_a","value":6555},{"type":"nop","payload":"p_vdrvvmes"}]},{"type":"scope","kind":"area","name":"n_hryvqzqy","body":[{"type":"let","variable":"x_a","value":4232},{"type":"scope","kind":"area","name":"n_xnmbanvl","body":[{"type":"let","variable":"x_a","value":5391},{"type":"scope","kind":"area","name":"n_zhamktmu","body":[{"type":"let","variable":"x_a","value":5952},{"type":"scope","kind":"area","name":"n_jqfandro","body":[{"type":"let","variable":"x_a","value":6359},{"type":"scope","kind":"func","name":"n_zelwcebd","body":[{"type":"let","variable":"x_a","value":1781}]}]}]}]}]}]}]}]}]}]}
```

**named_end**; trial `2cd808e703ac7a2b90c729a90e2d49d297b2e18a0fcbdda3583c47b8d1849054`; outcome `correct`; gold `{"body":[{"type":"let","value":9692,"variable":"x_a"},{"body":[{"type":"let","value":4213,"variable":"x_a"},{"payload":"p_buwcanud","type":"nop"}],"kind":"func","name":"n_hbatxhvc","type":"scope"},{"body":[{"type":"let","value":7733,"variable":"x_a"},{"body":[{"type":"let","value":9184,"variable":"x_a"},{"body":[{"type":"let","value":9033,"variable":"x_a"},{"body":[{"type":"let","value":5743,"variable":"x_a"},{"body":[{"type":"let","value":4911,"variable":"x_a"},{"body":[{"type":"let","value":3685,"variable":"x_a"},{"body":[{"type":"let","value":3334,"variable":"x_a"},{"body":[{"type":"let","value":2919,"variable":"x_a"},{"payload":"p_ovbhclll","type":"nop"}],"kind":"unit","name":"n_ebkdydyd","type":"scope"},{"body":[{"body":[{"type":"let","value":8395,"variable":"x_a"},{"body":[{"type":"let","value":2383,"variable":"x_a"},{"body":[{"type":"let","value":8488,"variable":"x_a"},{"body":[{"type":"let","value":5149,"variable":"x_a"},{"body":[{"type":"let","value":4241,"variable":"x_a"},{"body":[{"type":"let","value":4391,"variable":"x_a"},{"body":[{"type":"let","value":1905,"variable":"x_a"},{"body":[{"type":"let","value":4293,"variable":"x_a"}],"kind":"func","name":"n_usucjkwh","type":"scope"}],"kind":"area","name":"n_hnxbhyok","type":"scope"}],"kind":"unit","name":"n_lbsphkhk","type":"scope"}],"kind":"area","name":"n_evyaxavc","type":"scope"}],"kind":"func","name":"n_fkmqetjo","type":"scope"}],"kind":"unit","name":"n_ppmxlczq","type":"scope"}],"kind":"func","name":"n_mltinmwn","type":"scope"}],"kind":"func","name":"n_dqnckqwo","type":"scope"}],"kind":"unit","name":"n_hjelalyh","type":"scope"}],"kind":"unit","name":"n_rmcfpbvl","type":"scope"}],"kind":"unit","name":"n_fhyjesgl","type":"scope"}],"kind":"unit","name":"n_sanienyx","type":"scope"}],"kind":"func","name":"n_axvttinr","type":"scope"}],"kind":"func","name":"n_dmhftoih","type":"scope"}],"kind":"func","name":"n_vlimskaq","type":"scope"}],"kind":"func","name":"n_uekgmqup","type":"scope"}]}`.

Input:

Full input: [failure-inputs/2cd808e703ac7a2b90c729a90e2d49d297b2e18a0fcbdda3583c47b8d1849054.txt](failure-inputs/2cd808e703ac7a2b90c729a90e2d49d297b2e18a0fcbdda3583c47b8d1849054.txt). Excerpt lines 1–40 of 299:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Parse the complete program into its neutral JSON abstract syntax tree.
Preserve every node, parent-child relationship, statement order, scope kind and name, variable and value, and nop payload.
Do not evaluate bindings or discard shadowed bindings or nop statements.
The root is a JSON object with exactly one field, body, containing an ordered array of statements.
A scope node has exactly these fields: {"type":"scope","kind":"func","name":"n_abcdefgh","body":[]}.
Its kind is the semantic category unit, func, or area, using the mapping in SYNTAX even when the input keywords differ.
A binding node has exactly these fields: {"type":"let","variable":"x_a","value":1739}.
A nop node has exactly these fields: {"type":"nop","payload":"p_abcdefgh"}.
Use the actual names, variables, integer values and payloads from the input, not these illustrative schema values.
Closing lines determine the end of a scope body and do not create AST nodes.
Object field order and whitespace may vary; body-array order must match the source statement order.
Return only the complete JSON AST, without Markdown fences or explanation.

SYNTAX
The kind keywords are unit for unit, func for func, and area for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with end KIND NAME on one line. KIND and NAME must repeat that block's opening keyword and name.
KIND is one of unit, func, area; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is let VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is nop PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
Program:
let x_b 1898
let x_a 9018
area n_imcgrbkz
let x_a 7207
nop p_qdggfdxg
end area n_imcgrbkz
area n_kamcsxht
let x_a 8346
func n_iqloaety
let x_a 7330
nop p_eeughnii
end func n_iqloaety
```

Raw answer:

```
{"body":[{"type":"let","variable":"x_a","value":9692},{"type":"scope","kind":"func","name":"n_hbatxhvc","body":[{"type":"let","variable":"x_a","value":4213},{"type":"nop","payload":"p_buwcanud"}]},{"type":"scope","kind":"func","name":"n_uekgmqup","body":[{"type":"let","variable":"x_a","value":7733},{"type":"scope","kind":"func","name":"n_vlimskaq","body":[{"type":"let","variable":"x_a","value":9184},{"type":"scope","kind":"func","name":"n_dmhftoih","body":[{"type":"let","variable":"x_a","value":9033},{"type":"scope","kind":"func","name":"n_axvttinr","body":[{"type":"let","variable":"x_a","value":5743},{"type":"scope","kind":"unit","name":"n_sanienyx","body":[{"type":"let","variable":"x_a","value":4911},{"type":"scope","kind":"unit","name":"n_fhyjesgl","body":[{"type":"let","variable":"x_a","value":3685},{"type":"scope","kind":"unit","name":"n_rmcfpbvl","body":[{"type":"let","variable":"x_a","value":3334},{"type":"scope","kind":"unit","name":"n_ebkdydyd","body":[{"type":"let","variable":"x_a","value":2919},{"type":"nop","payload":"p_ovbhclll"}]},{"type":"scope","kind":"unit","name":"n_hjelalyh","body":[{"type":"scope","kind":"func","name":"n_dqnckqwo","body":[{"type":"let","variable":"x_a","value":8395},{"type":"scope","kind":"func","name":"n_mltinmwn","body":[{"type":"let","variable":"x_a","value":2383},{"type":"scope","kind":"unit","name":"n_ppmxlczq","body":[{"type":"let","variable":"x_a","value":8488},{"type":"scope","kind":"func","name":"n_fkmqetjo","body":[{"type":"let","variable":"x_a","value":5149},{"type":"scope","kind":"area","name":"n_evyaxavc","body":[{"type":"let","variable":"x_a","value":4241},{"type":"scope","kind":"unit","name":"n_lbsphkhk","body":[{"type":"let","variable":"x_a","value":4391},{"type":"scope","kind":"area","name":"n_hnxbhyok","body":[{"type":"let","variable":"x_a","value":1905},{"type":"scope","kind":"func","name":"n_usucjkwh","body":[{"type":"let","variable":"x_a","value":4293}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}
```

**generic_end**; trial `2cd49cadd3cc4ae7e44e0d2494c5ed93ee9275d3146fa74cf1526498c1edfa49`; outcome `invalid_answer_format`; gold `{"body":[{"type":"let","value":9692,"variable":"x_a"},{"body":[{"type":"let","value":4213,"variable":"x_a"},{"payload":"p_buwcanud","type":"nop"}],"kind":"func","name":"n_hbatxhvc","type":"scope"},{"body":[{"type":"let","value":7733,"variable":"x_a"},{"body":[{"type":"let","value":9184,"variable":"x_a"},{"body":[{"type":"let","value":9033,"variable":"x_a"},{"body":[{"type":"let","value":5743,"variable":"x_a"},{"body":[{"type":"let","value":4911,"variable":"x_a"},{"body":[{"type":"let","value":3685,"variable":"x_a"},{"body":[{"type":"let","value":3334,"variable":"x_a"},{"body":[{"type":"let","value":2919,"variable":"x_a"},{"payload":"p_ovbhclll","type":"nop"}],"kind":"unit","name":"n_ebkdydyd","type":"scope"},{"body":[{"body":[{"type":"let","value":8395,"variable":"x_a"},{"body":[{"type":"let","value":2383,"variable":"x_a"},{"body":[{"type":"let","value":8488,"variable":"x_a"},{"body":[{"type":"let","value":5149,"variable":"x_a"},{"body":[{"type":"let","value":4241,"variable":"x_a"},{"body":[{"type":"let","value":4391,"variable":"x_a"},{"body":[{"type":"let","value":1905,"variable":"x_a"},{"body":[{"type":"let","value":4293,"variable":"x_a"}],"kind":"func","name":"n_usucjkwh","type":"scope"}],"kind":"area","name":"n_hnxbhyok","type":"scope"}],"kind":"unit","name":"n_lbsphkhk","type":"scope"}],"kind":"area","name":"n_evyaxavc","type":"scope"}],"kind":"func","name":"n_fkmqetjo","type":"scope"}],"kind":"unit","name":"n_ppmxlczq","type":"scope"}],"kind":"func","name":"n_mltinmwn","type":"scope"}],"kind":"func","name":"n_dqnckqwo","type":"scope"}],"kind":"unit","name":"n_hjelalyh","type":"scope"}],"kind":"unit","name":"n_rmcfpbvl","type":"scope"}],"kind":"unit","name":"n_fhyjesgl","type":"scope"}],"kind":"unit","name":"n_sanienyx","type":"scope"}],"kind":"func","name":"n_axvttinr","type":"scope"}],"kind":"func","name":"n_dmhftoih","type":"scope"}],"kind":"func","name":"n_vlimskaq","type":"scope"}],"kind":"func","name":"n_uekgmqup","type":"scope"}]}`.

AST diagnostics: ast_error_code=invalid_json, ast_error_path=$.

Input:

Full input: [failure-inputs/2cd49cadd3cc4ae7e44e0d2494c5ed93ee9275d3146fa74cf1526498c1edfa49.txt](failure-inputs/2cd49cadd3cc4ae7e44e0d2494c5ed93ee9275d3146fa74cf1526498c1edfa49.txt). Excerpt lines 1–40 of 299:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Parse the complete program into its neutral JSON abstract syntax tree.
Preserve every node, parent-child relationship, statement order, scope kind and name, variable and value, and nop payload.
Do not evaluate bindings or discard shadowed bindings or nop statements.
The root is a JSON object with exactly one field, body, containing an ordered array of statements.
A scope node has exactly these fields: {"type":"scope","kind":"func","name":"n_abcdefgh","body":[]}.
Its kind is the semantic category unit, func, or area, using the mapping in SYNTAX even when the input keywords differ.
A binding node has exactly these fields: {"type":"let","variable":"x_a","value":1739}.
A nop node has exactly these fields: {"type":"nop","payload":"p_abcdefgh"}.
Use the actual names, variables, integer values and payloads from the input, not these illustrative schema values.
Closing lines determine the end of a scope body and do not create AST nodes.
Object field order and whitespace may vary; body-array order must match the source statement order.
Return only the complete JSON AST, without Markdown fences or explanation.

SYNTAX
The kind keywords are unit for unit, func for func, and area for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with end on its own line.
KIND is one of unit, func, area; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is let VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is nop PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
Program:
let x_b 1898
let x_a 9018
area n_imcgrbkz
let x_a 7207
nop p_qdggfdxg
end
area n_kamcsxht
let x_a 8346
func n_iqloaety
let x_a 7330
nop p_eeughnii
end
```

Raw answer:

```
{"body":[{"type":"let","variable":"x_a","value":9692},{"type":"scope","kind":"func","name":"n_hbatxhvc","body":[{"type":"let","variable":"x_a","value":4213},{"type":"nop","payload":"p_buwcanud"}]},{"type":"scope","kind":"func","name":"n_uekgmqup","body":[{"type":"let","variable":"x_a","value":7733},{"type":"scope","kind":"func","name":"n_vlimskaq","body":[{"type":"let","variable":"x_a","value":9184},{"type":"scope","kind":"func","name":"n_dmhftoih","body":[{"type":"let","variable":"x_a","value":9033},{"type":"scope","kind":"func","name":"n_axvttinr","body":[{"type":"let","variable":"x_a","value":5743},{"type":"scope","kind":"unit","name":"n_sanienyx","body":[{"type":"let","variable":"x_a","value":4911},{"type":"scope","kind":"unit","name":"n_fhyjesgl","body":[{"type":"let","variable":"x_a","value":3685},{"type":"scope","kind":"unit","name":"n_rmcfpbvl","body":[{"type":"let","variable":"x_a","value":3334},{"type":"scope","kind":"unit","name":"n_ebkdydyd","body":[{"type":"let","variable":"x_a","value":2919},{"type":"nop","payload":"p_ovbhclll"}]},{"type":"scope","kind":"unit","name":"n_hjelalyh","body":[{"type":"scope","kind":"func","name":"n_dqnckqwo","body":[{"type":"let","variable":"x_a","value":8395},{"type":"scope","kind":"func","name":"n_mltinmwn","body":[{"type":"let","variable":"x_a","value":2383},{"type":"scope","kind":"unit","name":"n_ppmxlczq","body":[{"type":"let","variable":"x_a","value":8488},{"type":"scope","kind":"func","name":"n_fkmqetjo","body":[{"type":"let","variable":"x_a","value":5149},{"type":"scope","kind":"area","name":"n_evyaxavc","body":[{"type":"let","variable":"x_a","value":4241},{"type":"scope","kind":"unit","name":"n_lbsphkhk","body":[{"type":"let","variable":"x_a","value":4391},{"type":"scope","kind":"area","name":"n_hnxbhyok","body":[{"type":"let","variable":"x_a","value":1905},{"type":"scope","kind":"func","name":"n_usucjkwh","body":[{"type":"let","variable":"x_a","value":4293}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}
```

### D wrong / B correct

**named_end**; trial `575d95e51b33a704fd77413dd4bbdfb823be55ba8f23163f4f53584a5dd1165c`; outcome `invalid_answer_format`; gold `{"body":[{"type":"let","value":9961,"variable":"x_a"},{"body":[{"type":"let","value":9.13E+3,"variable":"x_a"},{"payload":"p_gjddympn","type":"nop"}],"kind":"unit","name":"n_erxvygci","type":"scope"},{"body":[{"type":"let","value":4845,"variable":"x_a"},{"body":[{"type":"let","value":3534,"variable":"x_a"},{"body":[{"type":"let","value":1.14E+3,"variable":"x_a"},{"body":[{"type":"let","value":1654,"variable":"x_a"},{"payload":"p_rvotrpew","type":"nop"}],"kind":"area","name":"n_xamiuajv","type":"scope"},{"body":[{"type":"let","value":5572,"variable":"x_a"},{"body":[{"type":"let","value":7171,"variable":"x_a"},{"body":[{"type":"let","value":4.4E+3,"variable":"x_a"},{"body":[{"type":"let","value":9815,"variable":"x_a"},{"body":[{"type":"let","value":8409,"variable":"x_a"},{"payload":"p_rievsgne","type":"nop"},{"payload":"p_hnpbhrux","type":"nop"},{"payload":"p_jdtdrgtq","type":"nop"},{"payload":"p_novlarxp","type":"nop"},{"payload":"p_gxffydih","type":"nop"},{"payload":"p_nqxvwyhz","type":"nop"},{"payload":"p_icetnhcq","type":"nop"},{"payload":"p_vrimtaoc","type":"nop"}],"kind":"func","name":"n_bcqwwhrj","type":"scope"}],"kind":"func","name":"n_dlirnhjs","type":"scope"}],"kind":"unit","name":"n_ofmmmyup","type":"scope"}],"kind":"area","name":"n_hzrdwhlt","type":"scope"}],"kind":"func","name":"n_oeupaixy","type":"scope"}],"kind":"func","name":"n_ioelcpuq","type":"scope"}],"kind":"unit","name":"n_ysjyvevk","type":"scope"}],"kind":"func","name":"n_qwgqhpew","type":"scope"}]}`.

AST diagnostics: ast_error_code=invalid_json, ast_error_path=$.

Input:

Full input: [failure-inputs/575d95e51b33a704fd77413dd4bbdfb823be55ba8f23163f4f53584a5dd1165c.txt](failure-inputs/575d95e51b33a704fd77413dd4bbdfb823be55ba8f23163f4f53584a5dd1165c.txt). Excerpt lines 1–40 of 284:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Parse the complete program into its neutral JSON abstract syntax tree.
Preserve every node, parent-child relationship, statement order, scope kind and name, variable and value, and nop payload.
Do not evaluate bindings or discard shadowed bindings or nop statements.
The root is a JSON object with exactly one field, body, containing an ordered array of statements.
A scope node has exactly these fields: {"type":"scope","kind":"func","name":"n_abcdefgh","body":[]}.
Its kind is the semantic category unit, func, or area, using the mapping in SYNTAX even when the input keywords differ.
A binding node has exactly these fields: {"type":"let","variable":"x_a","value":1739}.
A nop node has exactly these fields: {"type":"nop","payload":"p_abcdefgh"}.
Use the actual names, variables, integer values and payloads from the input, not these illustrative schema values.
Closing lines determine the end of a scope body and do not create AST nodes.
Object field order and whitespace may vary; body-array order must match the source statement order.
Return only the complete JSON AST, without Markdown fences or explanation.

SYNTAX
The kind keywords are xaru for unit, telo for func, and gupi for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with nix KIND NAME on one line. KIND and NAME must repeat that block's opening keyword and name.
KIND is one of xaru, telo, gupi; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is sem VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is bov PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
Program:
sem x_b 1898
sem x_a 9018
gupi n_imcgrbkz
sem x_a 7207
bov p_qdggfdxg
nix gupi n_imcgrbkz
gupi n_kamcsxht
sem x_a 8346
telo n_iqloaety
sem x_a 7330
bov p_eeughnii
nix telo n_iqloaety
```

Raw answer:

```
{"body":[{"type":"let","variable":"x_a","value":9961},{"type":"scope","kind":"unit","name":"n_erxvygci","body":[{"type":"let","variable":"x_a","value":9130},{"type":"nop","payload":"p_gjddympn"}]},{"type":"scope","kind":"func","name":"n_qwgqhpew","body":[{"type":"let","variable":"x_a","value":4845},{"type":"scope","kind":"unit","name":"n_ysjyvevk","body":[{"type":"let","variable":"x_a","value":3534},{"type":"scope","kind":"func","name":"n_ioelcpuq","body":[{"type":"let","variable":"x_a","value":1140},{"type":"scope","kind":"area","name":"n_xamiuajv","body":[{"type":"let","variable":"x_a","value":1654},{"type":"nop","payload":"p_rvotrpew"}]},{"type":"scope","kind":"func","name":"n_oeupaixy","body":[{"type":"let","variable":"x_a","value":5572},{"type":"scope","kind":"area","name":"n_hzrdwhlt","body":[{"type":"let","variable":"x_a","value":7171},{"type":"scope","kind":"unit","name":"n_ofmmmyup","body":[{"type":"let","variable":"x_a","value":4400},{"type":"scope","kind":"func","name":"n_dlirnhjs","body":[{"type":"let","variable":"x_a","value":9815},{"type":"scope","kind":"func","name":"n_bcqwwhrj","body":[{"type":"let","variable":"x_a","value":8409},{"type":"nop","payload":"p_rievsgne"},{"type":"nop","payload":"p_hnpbhrux"},{"type":"nop","payload":"p_jdtdrgtq"},{"type":"nop","payload":"p_novlarxp"},{"type":"nop","payload":"p_gxffydih"},{"type":"nop","payload":"p_nqxvwyhz"},{"type":"nop","payload":"p_icetnhcq"},{"type":"nop","payload":"p_vrimtaoc"}]}]}]}]}]}]}]}]}]}]}
```

**generic_end**; trial `6c22f787303254a93331311354036e907b13fe7d02f1d77c54d1200741f20449`; outcome `correct`; gold `{"body":[{"type":"let","value":9961,"variable":"x_a"},{"body":[{"type":"let","value":9.13E+3,"variable":"x_a"},{"payload":"p_gjddympn","type":"nop"}],"kind":"unit","name":"n_erxvygci","type":"scope"},{"body":[{"type":"let","value":4845,"variable":"x_a"},{"body":[{"type":"let","value":3534,"variable":"x_a"},{"body":[{"type":"let","value":1.14E+3,"variable":"x_a"},{"body":[{"type":"let","value":1654,"variable":"x_a"},{"payload":"p_rvotrpew","type":"nop"}],"kind":"area","name":"n_xamiuajv","type":"scope"},{"body":[{"type":"let","value":5572,"variable":"x_a"},{"body":[{"type":"let","value":7171,"variable":"x_a"},{"body":[{"type":"let","value":4.4E+3,"variable":"x_a"},{"body":[{"type":"let","value":9815,"variable":"x_a"},{"body":[{"type":"let","value":8409,"variable":"x_a"},{"payload":"p_rievsgne","type":"nop"},{"payload":"p_hnpbhrux","type":"nop"},{"payload":"p_jdtdrgtq","type":"nop"},{"payload":"p_novlarxp","type":"nop"},{"payload":"p_gxffydih","type":"nop"},{"payload":"p_nqxvwyhz","type":"nop"},{"payload":"p_icetnhcq","type":"nop"},{"payload":"p_vrimtaoc","type":"nop"}],"kind":"func","name":"n_bcqwwhrj","type":"scope"}],"kind":"func","name":"n_dlirnhjs","type":"scope"}],"kind":"unit","name":"n_ofmmmyup","type":"scope"}],"kind":"area","name":"n_hzrdwhlt","type":"scope"}],"kind":"func","name":"n_oeupaixy","type":"scope"}],"kind":"func","name":"n_ioelcpuq","type":"scope"}],"kind":"unit","name":"n_ysjyvevk","type":"scope"}],"kind":"func","name":"n_qwgqhpew","type":"scope"}]}`.

Input:

Full input: [failure-inputs/6c22f787303254a93331311354036e907b13fe7d02f1d77c54d1200741f20449.txt](failure-inputs/6c22f787303254a93331311354036e907b13fe7d02f1d77c54d1200741f20449.txt). Excerpt lines 1–40 of 284:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Parse the complete program into its neutral JSON abstract syntax tree.
Preserve every node, parent-child relationship, statement order, scope kind and name, variable and value, and nop payload.
Do not evaluate bindings or discard shadowed bindings or nop statements.
The root is a JSON object with exactly one field, body, containing an ordered array of statements.
A scope node has exactly these fields: {"type":"scope","kind":"func","name":"n_abcdefgh","body":[]}.
Its kind is the semantic category unit, func, or area, using the mapping in SYNTAX even when the input keywords differ.
A binding node has exactly these fields: {"type":"let","variable":"x_a","value":1739}.
A nop node has exactly these fields: {"type":"nop","payload":"p_abcdefgh"}.
Use the actual names, variables, integer values and payloads from the input, not these illustrative schema values.
Closing lines determine the end of a scope body and do not create AST nodes.
Object field order and whitespace may vary; body-array order must match the source statement order.
Return only the complete JSON AST, without Markdown fences or explanation.

SYNTAX
The kind keywords are xaru for unit, telo for func, and gupi for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with nix on its own line.
KIND is one of xaru, telo, gupi; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is sem VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is bov PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
Program:
sem x_b 1898
sem x_a 9018
gupi n_imcgrbkz
sem x_a 7207
bov p_qdggfdxg
nix
gupi n_kamcsxht
sem x_a 8346
telo n_iqloaety
sem x_a 7330
bov p_eeughnii
nix
```

Raw answer:

```
{"body":[{"type":"let","variable":"x_a","value":9961},{"type":"scope","kind":"unit","name":"n_erxvygci","body":[{"type":"let","variable":"x_a","value":9130},{"type":"nop","payload":"p_gjddympn"}]},{"type":"scope","kind":"func","name":"n_qwgqhpew","body":[{"type":"let","variable":"x_a","value":4845},{"type":"scope","kind":"unit","name":"n_ysjyvevk","body":[{"type":"let","variable":"x_a","value":3534},{"type":"scope","kind":"func","name":"n_ioelcpuq","body":[{"type":"let","variable":"x_a","value":1140},{"type":"scope","kind":"area","name":"n_xamiuajv","body":[{"type":"let","variable":"x_a","value":1654},{"type":"nop","payload":"p_rvotrpew"}]},{"type":"scope","kind":"func","name":"n_oeupaixy","body":[{"type":"let","variable":"x_a","value":5572},{"type":"scope","kind":"area","name":"n_hzrdwhlt","body":[{"type":"let","variable":"x_a","value":7171},{"type":"scope","kind":"unit","name":"n_ofmmmyup","body":[{"type":"let","variable":"x_a","value":4400},{"type":"scope","kind":"func","name":"n_dlirnhjs","body":[{"type":"let","variable":"x_a","value":9815},{"type":"scope","kind":"func","name":"n_bcqwwhrj","body":[{"type":"let","variable":"x_a","value":8409},{"type":"nop","payload":"p_rievsgne"},{"type":"nop","payload":"p_hnpbhrux"},{"type":"nop","payload":"p_jdtdrgtq"},{"type":"nop","payload":"p_novlarxp"},{"type":"nop","payload":"p_gxffydih"},{"type":"nop","payload":"p_nqxvwyhz"},{"type":"nop","payload":"p_icetnhcq"},{"type":"nop","payload":"p_vrimtaoc"}]}]}]}]}]}]}]}]}]}
```

**named_end**; trial `57820d22806b2dafe05f6504fea600c0b48f9701d56c2541c332d949a9de0f6f`; outcome `invalid_answer_format`; gold `{"body":[{"type":"let","value":7679,"variable":"x_a"},{"body":[{"type":"let","value":6862,"variable":"x_a"},{"payload":"p_gbykzasn","type":"nop"}],"kind":"area","name":"n_ftmfjlpr","type":"scope"},{"body":[{"type":"let","value":4066,"variable":"x_a"},{"body":[{"type":"let","value":8674,"variable":"x_a"},{"body":[{"type":"let","value":9572,"variable":"x_a"},{"body":[{"type":"let","value":2188,"variable":"x_a"},{"payload":"p_kwpwlgyh","type":"nop"}],"kind":"area","name":"n_mlaljdjw","type":"scope"},{"body":[{"type":"let","value":3927,"variable":"x_a"},{"body":[{"type":"let","value":2709,"variable":"x_a"},{"body":[{"type":"let","value":7786,"variable":"x_a"},{"body":[{"type":"let","value":5898,"variable":"x_a"},{"body":[{"type":"let","value":8019,"variable":"x_a"},{"payload":"p_cyviurwm","type":"nop"},{"payload":"p_tnfsmeuh","type":"nop"},{"payload":"p_nldmocxx","type":"nop"},{"payload":"p_clwmfnnd","type":"nop"},{"payload":"p_riapsgix","type":"nop"},{"payload":"p_zluggaff","type":"nop"},{"payload":"p_wwscceta","type":"nop"},{"payload":"p_zzbkosbh","type":"nop"},{"payload":"p_hmgaxkhn","type":"nop"},{"payload":"p_rzrqgjyh","type":"nop"},{"payload":"p_fpppknxc","type":"nop"},{"payload":"p_xykrgsxc","type":"nop"},{"payload":"p_unsealzf","type":"nop"},{"payload":"p_isavlnil","type":"nop"},{"payload":"p_icwtberm","type":"nop"},{"payload":"p_jrtweusf","type":"nop"},{"payload":"p_zntnovzx","type":"nop"},{"payload":"p_hmbwdczk","type":"nop"},{"payload":"p_hfvulxyd","type":"nop"},{"payload":"p_eesezelw","type":"nop"},{"payload":"p_yktofagn","type":"nop"},{"payload":"p_sbirjtuu","type":"nop"},{"payload":"p_fkgwmjod","type":"nop"},{"payload":"p_urccxxro","type":"nop"},{"payload":"p_jgioxtjj","type":"nop"},{"payload":"p_tyalcofh","type":"nop"},{"payload":"p_oipuwyec","type":"nop"},{"payload":"p_xdmazlxz","type":"nop"},{"payload":"p_luoipfpc","type":"nop"},{"payload":"p_gpmzkvtl","type":"nop"},{"payload":"p_ogywkjiv","type":"nop"},{"payload":"p_wkkxddmm","type":"nop"}],"kind":"func","name":"n_ylpybqoj","type":"scope"}],"kind":"unit","name":"n_egyytspi","type":"scope"}],"kind":"unit","name":"n_qaebseis","type":"scope"}],"kind":"unit","name":"n_hjoljsmx","type":"scope"}],"kind":"area","name":"n_nkavmguy","type":"scope"}],"kind":"func","name":"n_daagigzo","type":"scope"}],"kind":"unit","name":"n_lxdtxlpk","type":"scope"}],"kind":"func","name":"n_syuryocl","type":"scope"}]}`.

AST diagnostics: ast_error_code=invalid_json, ast_error_path=$.

Input:

Full input: [failure-inputs/57820d22806b2dafe05f6504fea600c0b48f9701d56c2541c332d949a9de0f6f.txt](failure-inputs/57820d22806b2dafe05f6504fea600c0b48f9701d56c2541c332d949a9de0f6f.txt). Excerpt lines 1–40 of 308:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Parse the complete program into its neutral JSON abstract syntax tree.
Preserve every node, parent-child relationship, statement order, scope kind and name, variable and value, and nop payload.
Do not evaluate bindings or discard shadowed bindings or nop statements.
The root is a JSON object with exactly one field, body, containing an ordered array of statements.
A scope node has exactly these fields: {"type":"scope","kind":"func","name":"n_abcdefgh","body":[]}.
Its kind is the semantic category unit, func, or area, using the mapping in SYNTAX even when the input keywords differ.
A binding node has exactly these fields: {"type":"let","variable":"x_a","value":1739}.
A nop node has exactly these fields: {"type":"nop","payload":"p_abcdefgh"}.
Use the actual names, variables, integer values and payloads from the input, not these illustrative schema values.
Closing lines determine the end of a scope body and do not create AST nodes.
Object field order and whitespace may vary; body-array order must match the source statement order.
Return only the complete JSON AST, without Markdown fences or explanation.

SYNTAX
The kind keywords are unit for unit, func for func, and area for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with end KIND NAME on one line. KIND and NAME must repeat that block's opening keyword and name.
KIND is one of unit, func, area; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is let VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is nop PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
Program:
let x_b 1898
let x_a 9018
area n_imcgrbkz
let x_a 7207
nop p_qdggfdxg
end area n_imcgrbkz
area n_kamcsxht
let x_a 8346
func n_iqloaety
let x_a 7330
nop p_eeughnii
end func n_iqloaety
```

Raw answer:

```
{"body":[{"type":"let","variable":"x_a","value":7679},{"type":"scope","kind":"area","name":"n_ftmfjlpr","body":[{"type":"let","variable":"x_a","value":6862},{"type":"nop","payload":"p_gbykzasn"}]},{"type":"scope","kind":"func","name":"n_syuryocl","body":[{"type":"let","variable":"x_a","value":4066},{"type":"scope","kind":"unit","name":"n_lxdtxlpk","body":[{"type":"let","variable":"x_a","value":8674},{"type":"scope","kind":"func","name":"n_daagigzo","body":[{"type":"let","variable":"x_a","value":9572},{"type":"scope","kind":"area","name":"n_mlaljdjw","body":[{"type":"let","variable":"x_a","value":2188},{"type":"nop","payload":"p_kwpwlgyh"}]},{"type":"scope","kind":"area","name":"n_nkavmguy","body":[{"type":"let","variable":"x_a","value":3927},{"type":"scope","kind":"unit","name":"n_hjoljsmx","body":[{"type":"let","variable":"x_a","value":2709},{"type":"scope","kind":"unit","name":"n_qaebseis","body":[{"type":"let","variable":"x_a","value":7786},{"type":"scope","kind":"unit","name":"n_egyytspi","body":[{"type":"let","variable":"x_a","value":5898},{"type":"scope","kind":"func","name":"n_ylpybqoj","body":[{"type":"let","variable":"x_a","value":8019},{"type":"nop","payload":"p_cyviurwm"},{"type":"nop","payload":"p_tnfsmeuh"},{"type":"nop","payload":"p_nldmocxx"},{"type":"nop","payload":"p_clwmfnnd"},{"type":"nop","payload":"p_riapsgix"},{"type":"nop","payload":"p_zluggaff"},{"type":"nop","payload":"p_wwscceta"},{"type":"nop","payload":"p_zzbkosbh"},{"type":"nop","payload":"p_hmgaxkhn"},{"type":"nop","payload":"p_rzrqgjyh"},{"type":"nop","payload":"p_fpppknxc"},{"type":"nop","payload":"p_xykrgsxc"},{"type":"nop","payload":"p_unsealzf"},{"type":"nop","payload":"p_isavlnil"},{"type":"nop","payload":"p_icwtberm"},{"type":"nop","payload":"p_jrtweusf"},{"type":"nop","payload":"p_zntnovzx"},{"type":"nop","payload":"p_hmbwdczk"},{"type":"nop","payload":"p_hfvulxyd"},{"type":"nop","payload":"p_eesezelw"},{"type":"nop","payload":"p_yktofagn"},{"type":"nop","payload":"p_sbirjtuu"},{"type":"nop","payload":"p_fkgwmjod"},{"type":"nop","payload":"p_urccxxro"},{"type":"nop","payload":"p_jgioxtjj"},{"type":"nop","payload":"p_tyalcofh"},{"type":"nop","payload":"p_oipuwyec"},{"type":"nop","payload":"p_xdmazlxz"},{"type":"nop","payload":"p_luoipfpc"},{"type":"nop","payload":"p_gpmzkvtl"},{"type":"nop","payload":"p_ogywkjiv"},{"type":"nop","payload":"p_wkkxddmm"}]}]}]}]}]}]}]}]}]}]}
```

**generic_end**; trial `d95f4daf209deb90f5ae6997400a9b54abdc386e5184de72419960811c5f3327`; outcome `correct`; gold `{"body":[{"type":"let","value":7679,"variable":"x_a"},{"body":[{"type":"let","value":6862,"variable":"x_a"},{"payload":"p_gbykzasn","type":"nop"}],"kind":"area","name":"n_ftmfjlpr","type":"scope"},{"body":[{"type":"let","value":4066,"variable":"x_a"},{"body":[{"type":"let","value":8674,"variable":"x_a"},{"body":[{"type":"let","value":9572,"variable":"x_a"},{"body":[{"type":"let","value":2188,"variable":"x_a"},{"payload":"p_kwpwlgyh","type":"nop"}],"kind":"area","name":"n_mlaljdjw","type":"scope"},{"body":[{"type":"let","value":3927,"variable":"x_a"},{"body":[{"type":"let","value":2709,"variable":"x_a"},{"body":[{"type":"let","value":7786,"variable":"x_a"},{"body":[{"type":"let","value":5898,"variable":"x_a"},{"body":[{"type":"let","value":8019,"variable":"x_a"},{"payload":"p_cyviurwm","type":"nop"},{"payload":"p_tnfsmeuh","type":"nop"},{"payload":"p_nldmocxx","type":"nop"},{"payload":"p_clwmfnnd","type":"nop"},{"payload":"p_riapsgix","type":"nop"},{"payload":"p_zluggaff","type":"nop"},{"payload":"p_wwscceta","type":"nop"},{"payload":"p_zzbkosbh","type":"nop"},{"payload":"p_hmgaxkhn","type":"nop"},{"payload":"p_rzrqgjyh","type":"nop"},{"payload":"p_fpppknxc","type":"nop"},{"payload":"p_xykrgsxc","type":"nop"},{"payload":"p_unsealzf","type":"nop"},{"payload":"p_isavlnil","type":"nop"},{"payload":"p_icwtberm","type":"nop"},{"payload":"p_jrtweusf","type":"nop"},{"payload":"p_zntnovzx","type":"nop"},{"payload":"p_hmbwdczk","type":"nop"},{"payload":"p_hfvulxyd","type":"nop"},{"payload":"p_eesezelw","type":"nop"},{"payload":"p_yktofagn","type":"nop"},{"payload":"p_sbirjtuu","type":"nop"},{"payload":"p_fkgwmjod","type":"nop"},{"payload":"p_urccxxro","type":"nop"},{"payload":"p_jgioxtjj","type":"nop"},{"payload":"p_tyalcofh","type":"nop"},{"payload":"p_oipuwyec","type":"nop"},{"payload":"p_xdmazlxz","type":"nop"},{"payload":"p_luoipfpc","type":"nop"},{"payload":"p_gpmzkvtl","type":"nop"},{"payload":"p_ogywkjiv","type":"nop"},{"payload":"p_wkkxddmm","type":"nop"}],"kind":"func","name":"n_ylpybqoj","type":"scope"}],"kind":"unit","name":"n_egyytspi","type":"scope"}],"kind":"unit","name":"n_qaebseis","type":"scope"}],"kind":"unit","name":"n_hjoljsmx","type":"scope"}],"kind":"area","name":"n_nkavmguy","type":"scope"}],"kind":"func","name":"n_daagigzo","type":"scope"}],"kind":"unit","name":"n_lxdtxlpk","type":"scope"}],"kind":"func","name":"n_syuryocl","type":"scope"}]}`.

Input:

Full input: [failure-inputs/d95f4daf209deb90f5ae6997400a9b54abdc386e5184de72419960811c5f3327.txt](failure-inputs/d95f4daf209deb90f5ae6997400a9b54abdc386e5184de72419960811c5f3327.txt). Excerpt lines 1–40 of 308:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Parse the complete program into its neutral JSON abstract syntax tree.
Preserve every node, parent-child relationship, statement order, scope kind and name, variable and value, and nop payload.
Do not evaluate bindings or discard shadowed bindings or nop statements.
The root is a JSON object with exactly one field, body, containing an ordered array of statements.
A scope node has exactly these fields: {"type":"scope","kind":"func","name":"n_abcdefgh","body":[]}.
Its kind is the semantic category unit, func, or area, using the mapping in SYNTAX even when the input keywords differ.
A binding node has exactly these fields: {"type":"let","variable":"x_a","value":1739}.
A nop node has exactly these fields: {"type":"nop","payload":"p_abcdefgh"}.
Use the actual names, variables, integer values and payloads from the input, not these illustrative schema values.
Closing lines determine the end of a scope body and do not create AST nodes.
Object field order and whitespace may vary; body-array order must match the source statement order.
Return only the complete JSON AST, without Markdown fences or explanation.

SYNTAX
The kind keywords are unit for unit, func for func, and area for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with end on its own line.
KIND is one of unit, func, area; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is let VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is nop PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
Program:
let x_b 1898
let x_a 9018
area n_imcgrbkz
let x_a 7207
nop p_qdggfdxg
end
area n_kamcsxht
let x_a 8346
func n_iqloaety
let x_a 7330
nop p_eeughnii
end
```

Raw answer:

```
{"body":[{"type":"let","variable":"x_a","value":7679},{"type":"scope","kind":"area","name":"n_ftmfjlpr","body":[{"type":"let","variable":"x_a","value":6862},{"type":"nop","payload":"p_gbykzasn"}]},{"type":"scope","kind":"func","name":"n_syuryocl","body":[{"type":"let","variable":"x_a","value":4066},{"type":"scope","kind":"unit","name":"n_lxdtxlpk","body":[{"type":"let","variable":"x_a","value":8674},{"type":"scope","kind":"func","name":"n_daagigzo","body":[{"type":"let","variable":"x_a","value":9572},{"type":"scope","kind":"area","name":"n_mlaljdjw","body":[{"type":"let","variable":"x_a","value":2188},{"type":"nop","payload":"p_kwpwlgyh"}]},{"type":"scope","kind":"area","name":"n_nkavmguy","body":[{"type":"let","variable":"x_a","value":3927},{"type":"scope","kind":"unit","name":"n_hjoljsmx","body":[{"type":"let","variable":"x_a","value":2709},{"type":"scope","kind":"unit","name":"n_qaebseis","body":[{"type":"let","variable":"x_a","value":7786},{"type":"scope","kind":"unit","name":"n_egyytspi","body":[{"type":"let","variable":"x_a","value":5898},{"type":"scope","kind":"func","name":"n_ylpybqoj","body":[{"type":"let","variable":"x_a","value":8019},{"type":"nop","payload":"p_cyviurwm"},{"type":"nop","payload":"p_tnfsmeuh"},{"type":"nop","payload":"p_nldmocxx"},{"type":"nop","payload":"p_clwmfnnd"},{"type":"nop","payload":"p_riapsgix"},{"type":"nop","payload":"p_zluggaff"},{"type":"nop","payload":"p_wwscceta"},{"type":"nop","payload":"p_zzbkosbh"},{"type":"nop","payload":"p_hmgaxkhn"},{"type":"nop","payload":"p_rzrqgjyh"},{"type":"nop","payload":"p_fpppknxc"},{"type":"nop","payload":"p_xykrgsxc"},{"type":"nop","payload":"p_unsealzf"},{"type":"nop","payload":"p_isavlnil"},{"type":"nop","payload":"p_icwtberm"},{"type":"nop","payload":"p_jrtweusf"},{"type":"nop","payload":"p_zntnovzx"},{"type":"nop","payload":"p_hmbwdczk"},{"type":"nop","payload":"p_hfvulxyd"},{"type":"nop","payload":"p_eesezelw"},{"type":"nop","payload":"p_yktofagn"},{"type":"nop","payload":"p_sbirjtuu"},{"type":"nop","payload":"p_fkgwmjod"},{"type":"nop","payload":"p_urccxxro"},{"type":"nop","payload":"p_jgioxtjj"},{"type":"nop","payload":"p_tyalcofh"},{"type":"nop","payload":"p_oipuwyec"},{"type":"nop","payload":"p_xdmazlxz"},{"type":"nop","payload":"p_luoipfpc"},{"type":"nop","payload":"p_gpmzkvtl"},{"type":"nop","payload":"p_ogywkjiv"},{"type":"nop","payload":"p_wkkxddmm"}]}]}]}]}]}]}]}]}]}
```

**named_end**; trial `7dbcc45ec2ad357d0b714cdabeb3f8adadc37a21b69ae51c7b6bc4d6586d263e`; outcome `invalid_answer_format`; gold `{"body":[{"type":"let","value":7774,"variable":"x_a"},{"body":[{"type":"let","value":6152,"variable":"x_a"},{"payload":"p_znioafce","type":"nop"}],"kind":"area","name":"n_vohncrdk","type":"scope"},{"body":[{"type":"let","value":5.96E+3,"variable":"x_a"},{"body":[{"type":"let","value":5257,"variable":"x_a"},{"body":[{"type":"let","value":7968,"variable":"x_a"},{"body":[{"type":"let","value":1.82E+3,"variable":"x_a"},{"payload":"p_nbtoczvb","type":"nop"}],"kind":"func","name":"n_szepdtrh","type":"scope"},{"body":[{"body":[{"type":"let","value":9524,"variable":"x_a"},{"body":[{"type":"let","value":5938,"variable":"x_a"},{"body":[{"type":"let","value":6134,"variable":"x_a"},{"body":[{"type":"let","value":5401,"variable":"x_a"},{"payload":"p_xxlkwkof","type":"nop"},{"payload":"p_kgyahzwq","type":"nop"},{"payload":"p_mjburpww","type":"nop"},{"payload":"p_gxaowpwu","type":"nop"},{"payload":"p_wkumghyw","type":"nop"},{"payload":"p_trzvflaj","type":"nop"},{"payload":"p_tfrhsrag","type":"nop"},{"payload":"p_naqxzkkc","type":"nop"},{"payload":"p_behrfhxo","type":"nop"},{"payload":"p_nmbdjpwi","type":"nop"},{"payload":"p_kllxufob","type":"nop"},{"payload":"p_zlwhkvlo","type":"nop"},{"payload":"p_bkpibbcq","type":"nop"},{"payload":"p_tylcklai","type":"nop"},{"payload":"p_bgvmxvkc","type":"nop"},{"payload":"p_ybnkywrx","type":"nop"},{"payload":"p_rcfghqhj","type":"nop"},{"payload":"p_drtsuyua","type":"nop"},{"payload":"p_khqezkkp","type":"nop"},{"payload":"p_zoiaxiwc","type":"nop"},{"payload":"p_dtulaypk","type":"nop"},{"payload":"p_isizhfmw","type":"nop"},{"payload":"p_vacglyfh","type":"nop"},{"payload":"p_alkpgqee","type":"nop"},{"payload":"p_jcwwacpo","type":"nop"},{"payload":"p_fajachut","type":"nop"},{"payload":"p_xwaixpzp","type":"nop"},{"payload":"p_qducphct","type":"nop"},{"payload":"p_nnkcrbdm","type":"nop"},{"payload":"p_shrbywuy","type":"nop"},{"payload":"p_eexkmylk","type":"nop"},{"payload":"p_rrgzcltw","type":"nop"}],"kind":"func","name":"n_nshcjaod","type":"scope"}],"kind":"unit","name":"n_sfehgiax","type":"scope"}],"kind":"unit","name":"n_bpxekyzk","type":"scope"}],"kind":"func","name":"n_dicnzrvv","type":"scope"}],"kind":"area","name":"n_yknjxuqu","type":"scope"}],"kind":"func","name":"n_dgmktlvf","type":"scope"}],"kind":"func","name":"n_rzufqprn","type":"scope"}],"kind":"area","name":"n_gyqwgore","type":"scope"}]}`.

AST diagnostics: ast_error_code=invalid_json, ast_error_path=$.

Input:

Full input: [failure-inputs/7dbcc45ec2ad357d0b714cdabeb3f8adadc37a21b69ae51c7b6bc4d6586d263e.txt](failure-inputs/7dbcc45ec2ad357d0b714cdabeb3f8adadc37a21b69ae51c7b6bc4d6586d263e.txt). Excerpt lines 1–40 of 307:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Parse the complete program into its neutral JSON abstract syntax tree.
Preserve every node, parent-child relationship, statement order, scope kind and name, variable and value, and nop payload.
Do not evaluate bindings or discard shadowed bindings or nop statements.
The root is a JSON object with exactly one field, body, containing an ordered array of statements.
A scope node has exactly these fields: {"type":"scope","kind":"func","name":"n_abcdefgh","body":[]}.
Its kind is the semantic category unit, func, or area, using the mapping in SYNTAX even when the input keywords differ.
A binding node has exactly these fields: {"type":"let","variable":"x_a","value":1739}.
A nop node has exactly these fields: {"type":"nop","payload":"p_abcdefgh"}.
Use the actual names, variables, integer values and payloads from the input, not these illustrative schema values.
Closing lines determine the end of a scope body and do not create AST nodes.
Object field order and whitespace may vary; body-array order must match the source statement order.
Return only the complete JSON AST, without Markdown fences or explanation.

SYNTAX
The kind keywords are nezu for unit, sapu for func, and jomi for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with wor KIND NAME on one line. KIND and NAME must repeat that block's opening keyword and name.
KIND is one of nezu, sapu, jomi; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is fal VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is kiv PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
Program:
fal x_b 1898
fal x_a 9018
jomi n_imcgrbkz
fal x_a 7207
kiv p_qdggfdxg
wor jomi n_imcgrbkz
jomi n_kamcsxht
fal x_a 8346
sapu n_iqloaety
fal x_a 7330
kiv p_eeughnii
wor sapu n_iqloaety
```

Raw answer:

```
{"body":[{"type":"let","variable":"x_a","value":7774},{"type":"scope","kind":"area","name":"n_vohncrdk","body":[{"type":"let","variable":"x_a","value":6152},{"type":"nop","payload":"p_znioafce"}]},{"type":"scope","kind":"area","name":"n_gyqwgore","body":[{"type":"let","variable":"x_a","value":5960},{"type":"scope","kind":"func","name":"n_rzufqprn","body":[{"type":"let","variable":"x_a","value":5257},{"type":"scope","kind":"func","name":"n_dgmktlvf","body":[{"type":"let","variable":"x_a","value":7968},{"type":"scope","kind":"func","name":"n_szepdtrh","body":[{"type":"let","variable":"x_a","value":1820},{"type":"nop","payload":"p_nbtoczvb"}]},{"type":"scope","kind":"area","name":"n_yknjxuqu","body":[{"type":"scope","kind":"func","name":"n_dicnzrvv","body":[{"type":"let","variable":"x_a","value":9524},{"type":"scope","kind":"unit","name":"n_bpxekyzk","body":[{"type":"let","variable":"x_a","value":5938},{"type":"scope","kind":"unit","name":"n_sfehgiax","body":[{"type":"let","variable":"x_a","value":6134},{"type":"scope","kind":"func","name":"n_nshcjaod","body":[{"type":"let","variable":"x_a","value":5401},{"type":"nop","payload":"p_xxlkwkof"},{"type":"nop","payload":"p_kgyahzwq"},{"type":"nop","payload":"p_mjburpww"},{"type":"nop","payload":"p_gxaowpwu"},{"type":"nop","payload":"p_wkumghyw"},{"type":"nop","payload":"p_trzvflaj"},{"type":"nop","payload":"p_tfrhsrag"},{"type":"nop","payload":"p_naqxzkkc"},{"type":"nop","payload":"p_behrfhxo"},{"type":"nop","payload":"p_nmbdjpwi"},{"type":"nop","payload":"p_kllxufob"},{"type":"nop","payload":"p_zlwhkvlo"},{"type":"nop","payload":"p_bkpibbcq"},{"type":"nop","payload":"p_tylcklai"},{"type":"nop","payload":"p_bgvmxvkc"},{"type":"nop","payload":"p_ybnkywrx"},{"type":"nop","payload":"p_rcfghqhj"},{"type":"nop","payload":"p_drtsuyua"},{"type":"nop","payload":"p_khqezkkp"},{"type":"nop","payload":"p_zoiaxiwc"},{"type":"nop","payload":"p_dtulaypk"},{"type":"nop","payload":"p_isizhfmw"},{"type":"nop","payload":"p_vacglyfh"},{"type":"nop","payload":"p_alkpgqee"},{"type":"nop","payload":"p_jcwwacpo"},{"type":"nop","payload":"p_fajachut"},{"type":"nop","payload":"p_xwaixpzp"},{"type":"nop","payload":"p_qducphct"},{"type":"nop","payload":"p_nnkcrbdm"},{"type":"nop","payload":"p_shrbywuy"},{"type":"nop","payload":"p_eexkmylk"},{"type":"nop","payload":"p_rrgzcltw"}]}]}]}]}]}]}]}]}]}]}
```

**generic_end**; trial `3f505bcd6eaa758162db335384cafde79ab05bdb5622dcef2639f1c846467b26`; outcome `correct`; gold `{"body":[{"type":"let","value":7774,"variable":"x_a"},{"body":[{"type":"let","value":6152,"variable":"x_a"},{"payload":"p_znioafce","type":"nop"}],"kind":"area","name":"n_vohncrdk","type":"scope"},{"body":[{"type":"let","value":5.96E+3,"variable":"x_a"},{"body":[{"type":"let","value":5257,"variable":"x_a"},{"body":[{"type":"let","value":7968,"variable":"x_a"},{"body":[{"type":"let","value":1.82E+3,"variable":"x_a"},{"payload":"p_nbtoczvb","type":"nop"}],"kind":"func","name":"n_szepdtrh","type":"scope"},{"body":[{"body":[{"type":"let","value":9524,"variable":"x_a"},{"body":[{"type":"let","value":5938,"variable":"x_a"},{"body":[{"type":"let","value":6134,"variable":"x_a"},{"body":[{"type":"let","value":5401,"variable":"x_a"},{"payload":"p_xxlkwkof","type":"nop"},{"payload":"p_kgyahzwq","type":"nop"},{"payload":"p_mjburpww","type":"nop"},{"payload":"p_gxaowpwu","type":"nop"},{"payload":"p_wkumghyw","type":"nop"},{"payload":"p_trzvflaj","type":"nop"},{"payload":"p_tfrhsrag","type":"nop"},{"payload":"p_naqxzkkc","type":"nop"},{"payload":"p_behrfhxo","type":"nop"},{"payload":"p_nmbdjpwi","type":"nop"},{"payload":"p_kllxufob","type":"nop"},{"payload":"p_zlwhkvlo","type":"nop"},{"payload":"p_bkpibbcq","type":"nop"},{"payload":"p_tylcklai","type":"nop"},{"payload":"p_bgvmxvkc","type":"nop"},{"payload":"p_ybnkywrx","type":"nop"},{"payload":"p_rcfghqhj","type":"nop"},{"payload":"p_drtsuyua","type":"nop"},{"payload":"p_khqezkkp","type":"nop"},{"payload":"p_zoiaxiwc","type":"nop"},{"payload":"p_dtulaypk","type":"nop"},{"payload":"p_isizhfmw","type":"nop"},{"payload":"p_vacglyfh","type":"nop"},{"payload":"p_alkpgqee","type":"nop"},{"payload":"p_jcwwacpo","type":"nop"},{"payload":"p_fajachut","type":"nop"},{"payload":"p_xwaixpzp","type":"nop"},{"payload":"p_qducphct","type":"nop"},{"payload":"p_nnkcrbdm","type":"nop"},{"payload":"p_shrbywuy","type":"nop"},{"payload":"p_eexkmylk","type":"nop"},{"payload":"p_rrgzcltw","type":"nop"}],"kind":"func","name":"n_nshcjaod","type":"scope"}],"kind":"unit","name":"n_sfehgiax","type":"scope"}],"kind":"unit","name":"n_bpxekyzk","type":"scope"}],"kind":"func","name":"n_dicnzrvv","type":"scope"}],"kind":"area","name":"n_yknjxuqu","type":"scope"}],"kind":"func","name":"n_dgmktlvf","type":"scope"}],"kind":"func","name":"n_rzufqprn","type":"scope"}],"kind":"area","name":"n_gyqwgore","type":"scope"}]}`.

Input:

Full input: [failure-inputs/3f505bcd6eaa758162db335384cafde79ab05bdb5622dcef2639f1c846467b26.txt](failure-inputs/3f505bcd6eaa758162db335384cafde79ab05bdb5622dcef2639f1c846467b26.txt). Excerpt lines 1–40 of 307:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Parse the complete program into its neutral JSON abstract syntax tree.
Preserve every node, parent-child relationship, statement order, scope kind and name, variable and value, and nop payload.
Do not evaluate bindings or discard shadowed bindings or nop statements.
The root is a JSON object with exactly one field, body, containing an ordered array of statements.
A scope node has exactly these fields: {"type":"scope","kind":"func","name":"n_abcdefgh","body":[]}.
Its kind is the semantic category unit, func, or area, using the mapping in SYNTAX even when the input keywords differ.
A binding node has exactly these fields: {"type":"let","variable":"x_a","value":1739}.
A nop node has exactly these fields: {"type":"nop","payload":"p_abcdefgh"}.
Use the actual names, variables, integer values and payloads from the input, not these illustrative schema values.
Closing lines determine the end of a scope body and do not create AST nodes.
Object field order and whitespace may vary; body-array order must match the source statement order.
Return only the complete JSON AST, without Markdown fences or explanation.

SYNTAX
The kind keywords are nezu for unit, sapu for func, and jomi for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with wor on its own line.
KIND is one of nezu, sapu, jomi; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is fal VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is kiv PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
Program:
fal x_b 1898
fal x_a 9018
jomi n_imcgrbkz
fal x_a 7207
kiv p_qdggfdxg
wor
jomi n_kamcsxht
fal x_a 8346
sapu n_iqloaety
fal x_a 7330
kiv p_eeughnii
wor
```

Raw answer:

```
{"body":[{"type":"let","variable":"x_a","value":7774},{"type":"scope","kind":"area","name":"n_vohncrdk","body":[{"type":"let","variable":"x_a","value":6152},{"type":"nop","payload":"p_znioafce"}]},{"type":"scope","kind":"area","name":"n_gyqwgore","body":[{"type":"let","variable":"x_a","value":5960},{"type":"scope","kind":"func","name":"n_rzufqprn","body":[{"type":"let","variable":"x_a","value":5257},{"type":"scope","kind":"func","name":"n_dgmktlvf","body":[{"type":"let","variable":"x_a","value":7968},{"type":"scope","kind":"func","name":"n_szepdtrh","body":[{"type":"let","variable":"x_a","value":1820},{"type":"nop","payload":"p_nbtoczvb"}]},{"type":"scope","kind":"area","name":"n_yknjxuqu","body":[{"type":"scope","kind":"func","name":"n_dicnzrvv","body":[{"type":"let","variable":"x_a","value":9524},{"type":"scope","kind":"unit","name":"n_bpxekyzk","body":[{"type":"let","variable":"x_a","value":5938},{"type":"scope","kind":"unit","name":"n_sfehgiax","body":[{"type":"let","variable":"x_a","value":6134},{"type":"scope","kind":"func","name":"n_nshcjaod","body":[{"type":"let","variable":"x_a","value":5401},{"type":"nop","payload":"p_xxlkwkof"},{"type":"nop","payload":"p_kgyahzwq"},{"type":"nop","payload":"p_mjburpww"},{"type":"nop","payload":"p_gxaowpwu"},{"type":"nop","payload":"p_wkumghyw"},{"type":"nop","payload":"p_trzvflaj"},{"type":"nop","payload":"p_tfrhsrag"},{"type":"nop","payload":"p_naqxzkkc"},{"type":"nop","payload":"p_behrfhxo"},{"type":"nop","payload":"p_nmbdjpwi"},{"type":"nop","payload":"p_kllxufob"},{"type":"nop","payload":"p_zlwhkvlo"},{"type":"nop","payload":"p_bkpibbcq"},{"type":"nop","payload":"p_tylcklai"},{"type":"nop","payload":"p_bgvmxvkc"},{"type":"nop","payload":"p_ybnkywrx"},{"type":"nop","payload":"p_rcfghqhj"},{"type":"nop","payload":"p_drtsuyua"},{"type":"nop","payload":"p_khqezkkp"},{"type":"nop","payload":"p_zoiaxiwc"},{"type":"nop","payload":"p_dtulaypk"},{"type":"nop","payload":"p_isizhfmw"},{"type":"nop","payload":"p_vacglyfh"},{"type":"nop","payload":"p_alkpgqee"},{"type":"nop","payload":"p_jcwwacpo"},{"type":"nop","payload":"p_fajachut"},{"type":"nop","payload":"p_xwaixpzp"},{"type":"nop","payload":"p_qducphct"},{"type":"nop","payload":"p_nnkcrbdm"},{"type":"nop","payload":"p_shrbywuy"},{"type":"nop","payload":"p_eexkmylk"},{"type":"nop","payload":"p_rrgzcltw"}]}]}]}]}]}]}]}]}]}
```

### both wrong

**named_end**; trial `0f921d9c827abba08a66b184b6f9fa63d128741c47d259e8db3957a89e5505fc`; outcome `invalid_answer_format`; gold `{"body":[{"type":"let","value":1652,"variable":"x_a"},{"body":[{"type":"let","value":7671,"variable":"x_a"},{"payload":"p_kkqbfacm","type":"nop"}],"kind":"area","name":"n_gvigbimq","type":"scope"},{"body":[{"type":"let","value":1663,"variable":"x_a"},{"body":[{"type":"let","value":3.11E+3,"variable":"x_a"},{"body":[{"type":"let","value":3968,"variable":"x_a"},{"body":[{"type":"let","value":3414,"variable":"x_a"},{"body":[{"type":"let","value":1945,"variable":"x_a"},{"body":[{"type":"let","value":1.63E+3,"variable":"x_a"},{"body":[{"type":"let","value":4191,"variable":"x_a"},{"body":[{"type":"let","value":5131,"variable":"x_a"},{"payload":"p_owsbefgq","type":"nop"}],"kind":"func","name":"n_upwzfqyf","type":"scope"},{"body":[{"body":[{"type":"let","value":7291,"variable":"x_a"},{"body":[{"type":"let","value":9218,"variable":"x_a"},{"body":[{"type":"let","value":8538,"variable":"x_a"},{"body":[{"type":"let","value":5788,"variable":"x_a"},{"body":[{"type":"let","value":3396,"variable":"x_a"},{"body":[{"type":"let","value":2233,"variable":"x_a"},{"body":[{"type":"let","value":8355,"variable":"x_a"},{"body":[{"type":"let","value":2656,"variable":"x_a"},{"payload":"p_onnxjamj","type":"nop"},{"payload":"p_frxgiolc","type":"nop"},{"payload":"p_ubzonkgj","type":"nop"},{"payload":"p_eqpycbad","type":"nop"},{"payload":"p_aujkpdxj","type":"nop"},{"payload":"p_gkvocuit","type":"nop"},{"payload":"p_efinmxgg","type":"nop"},{"payload":"p_hcjwupmx","type":"nop"},{"payload":"p_figdefsq","type":"nop"},{"payload":"p_dtqrrapf","type":"nop"},{"payload":"p_ecnuseyb","type":"nop"},{"payload":"p_wxiqwsck","type":"nop"},{"payload":"p_qtbpdsoy","type":"nop"},{"payload":"p_oeguirav","type":"nop"},{"payload":"p_uggwmfxk","type":"nop"},{"payload":"p_kpovtwjk","type":"nop"},{"payload":"p_lppgnfps","type":"nop"},{"payload":"p_efhxkukn","type":"nop"},{"payload":"p_sanmddhi","type":"nop"},{"payload":"p_siryuwdh","type":"nop"},{"payload":"p_mbqjonui","type":"nop"},{"payload":"p_lvrxduio","type":"nop"},{"payload":"p_ayqccncx","type":"nop"},{"payload":"p_ahxbbhlk","type":"nop"},{"payload":"p_crsfwuhg","type":"nop"},{"payload":"p_nselhnfn","type":"nop"},{"payload":"p_ycbdlwxt","type":"nop"},{"payload":"p_ngqpxdbf","type":"nop"},{"payload":"p_ojjwihjw","type":"nop"},{"payload":"p_xowtrwey","type":"nop"},{"payload":"p_aveuufdl","type":"nop"},{"payload":"p_twdzdvgq","type":"nop"}],"kind":"func","name":"n_srzccekx","type":"scope"}],"kind":"unit","name":"n_nyhhhwls","type":"scope"}],"kind":"func","name":"n_jadtddlt","type":"scope"}],"kind":"area","name":"n_zhjajpre","type":"scope"}],"kind":"func","name":"n_umaaxcsp","type":"scope"}],"kind":"unit","name":"n_ysejfqil","type":"scope"}],"kind":"area","name":"n_xxsoyslo","type":"scope"}],"kind":"func","name":"n_avlmxvdp","type":"scope"}],"kind":"area","name":"n_nkxspaer","type":"scope"}],"kind":"area","name":"n_rqwrxyui","type":"scope"}],"kind":"unit","name":"n_siiguwcc","type":"scope"}],"kind":"unit","name":"n_ckeyqrqa","type":"scope"}],"kind":"func","name":"n_abociuel","type":"scope"}],"kind":"area","name":"n_xulpdezg","type":"scope"}],"kind":"func","name":"n_bxkklsuc","type":"scope"}],"kind":"area","name":"n_lojkqwkh","type":"scope"}]}`.

AST diagnostics: ast_error_code=invalid_json, ast_error_path=$.

Input:

Full input: [failure-inputs/0f921d9c827abba08a66b184b6f9fa63d128741c47d259e8db3957a89e5505fc.txt](failure-inputs/0f921d9c827abba08a66b184b6f9fa63d128741c47d259e8db3957a89e5505fc.txt). Excerpt lines 1–40 of 331:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Parse the complete program into its neutral JSON abstract syntax tree.
Preserve every node, parent-child relationship, statement order, scope kind and name, variable and value, and nop payload.
Do not evaluate bindings or discard shadowed bindings or nop statements.
The root is a JSON object with exactly one field, body, containing an ordered array of statements.
A scope node has exactly these fields: {"type":"scope","kind":"func","name":"n_abcdefgh","body":[]}.
Its kind is the semantic category unit, func, or area, using the mapping in SYNTAX even when the input keywords differ.
A binding node has exactly these fields: {"type":"let","variable":"x_a","value":1739}.
A nop node has exactly these fields: {"type":"nop","payload":"p_abcdefgh"}.
Use the actual names, variables, integer values and payloads from the input, not these illustrative schema values.
Closing lines determine the end of a scope body and do not create AST nodes.
Object field order and whitespace may vary; body-array order must match the source statement order.
Return only the complete JSON AST, without Markdown fences or explanation.

SYNTAX
The kind keywords are unit for unit, func for func, and area for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with end KIND NAME on one line. KIND and NAME must repeat that block's opening keyword and name.
KIND is one of unit, func, area; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is let VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is nop PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
Program:
let x_b 1898
let x_a 9018
area n_imcgrbkz
let x_a 7207
nop p_qdggfdxg
end area n_imcgrbkz
area n_kamcsxht
let x_a 8346
func n_iqloaety
let x_a 7330
nop p_eeughnii
end func n_iqloaety
```

Raw answer:

```
{"body":[{"type":"let","variable":"x_a","value":1652},{"type":"scope","kind":"area","name":"n_gvigbimq","body":[{"type":"let","variable":"x_a","value":7671},{"type":"nop","payload":"p_kkqbfacm"}]},{"type":"scope","kind":"area","name":"n_lojkqwkh","body":[{"type":"let","variable":"x_a","value":1663},{"type":"scope","kind":"func","name":"n_bxkklsuc","body":[{"type":"let","variable":"x_a","value":3110},{"type":"scope","kind":"area","name":"n_xulpdezg","body":[{"type":"let","variable":"x_a","value":3968},{"type":"scope","kind":"func","name":"n_abociuel","body":[{"type":"let","variable":"x_a","value":3414},{"type":"scope","kind":"unit","name":"n_ckeyqrqa","body":[{"type":"let","variable":"x_a","value":1945},{"type":"scope","kind":"unit","name":"n_siiguwcc","body":[{"type":"let","variable":"x_a","value":1630},{"type":"scope","kind":"area","name":"n_rqwrxyui","body":[{"type":"let","variable":"x_a","value":4191},{"type":"scope","kind":"func","name":"n_upwzfqyf","body":[{"type":"let","variable":"x_a","value":5131},{"type":"nop","payload":"p_owsbefgq"}]},{"type":"scope","kind":"area","name":"n_nkxspaer","body":[{"type":"scope","kind":"func","name":"n_avlmxvdp","body":[{"type":"let","variable":"x_a","value":7291},{"type":"scope","kind":"area","name":"n_xxsoyslo","body":[{"type":"let","variable":"x_a","value":9218},{"type":"scope","kind":"unit","name":"n_ysejfqil","body":[{"type":"let","variable":"x_a","value":8538},{"type":"scope","kind":"func","name":"n_umaaxcsp","body":[{"type":"let","variable":"x_a","value":5788},{"type":"scope","kind":"area","name":"n_zhjajpre","body":[{"type":"let","variable":"x_a","value":3396},{"type":"scope","kind":"func","name":"n_jadtddlt","body":[{"type":"let","variable":"x_a","value":2233},{"type":"scope","kind":"unit","name":"n_nyhhhwls","body":[{"type":"let","variable":"x_a","value":8355},{"type":"scope","kind":"func","name":"n_srzccekx","body":[{"type":"let","variable":"x_a","value":2656},{"type":"nop","payload":"p_onnxjamj"},{"type":"nop","payload":"p_frxgiolc"},{"type":"nop","payload":"p_ubzonkgj"},{"type":"nop","payload":"p_eqpycbad"},{"type":"nop","payload":"p_aujkpdxj"},{"type":"nop","payload":"p_gkvocuit"},{"type":"nop","payload":"p_efinmxgg"},{"type":"nop","payload":"p_hcjwupmx"},{"type":"nop","payload":"p_figdefsq"},{"type":"nop","payload":"p_dtqrrapf"},{"type":"nop","payload":"p_ecnuseyb"},{"type":"nop","payload":"p_wxiqwsck"},{"type":"nop","payload":"p_qtbpdsoy"},{"type":"nop","payload":"p_oeguirav"},{"type":"nop","payload":"p_uggwmfxk"},{"type":"nop","payload":"p_kpovtwjk"},{"type":"nop","payload":"p_lppgnfps"},{"type":"nop","payload":"p_efhxkukn"},{"type":"nop","payload":"p_sanmddhi"},{"type":"nop","payload":"p_siryuwdh"},{"type":"nop","payload":"p_mbqjonui"},{"type":"nop","payload":"p_lvrxduio"},{"type":"nop","payload":"p_ayqccncx"},{"type":"nop","payload":"p_ahxbbhlk"},{"type":"nop","payload":"p_crsfwuhg"},{"type":"nop","payload":"p_nselhnfn"},{"type":"nop","payload":"p_ycbdlwxt"},{"type":"nop","payload":"p_ngqpxdbf"},{"type":"nop","payload":"p_ojjwihjw"},{"type":"nop","payload":"p_xowtrwey"},{"type":"nop","payload":"p_aveuufdl"},{"type":"nop","payload":"p_twdzdvgq"}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}
```

**generic_end**; trial `b5c8dfdb763ced4dc4235fc03c2d64abad7cf3e1cb3fc070a1a3413c76284c16`; outcome `invalid_answer_format`; gold `{"body":[{"type":"let","value":1652,"variable":"x_a"},{"body":[{"type":"let","value":7671,"variable":"x_a"},{"payload":"p_kkqbfacm","type":"nop"}],"kind":"area","name":"n_gvigbimq","type":"scope"},{"body":[{"type":"let","value":1663,"variable":"x_a"},{"body":[{"type":"let","value":3.11E+3,"variable":"x_a"},{"body":[{"type":"let","value":3968,"variable":"x_a"},{"body":[{"type":"let","value":3414,"variable":"x_a"},{"body":[{"type":"let","value":1945,"variable":"x_a"},{"body":[{"type":"let","value":1.63E+3,"variable":"x_a"},{"body":[{"type":"let","value":4191,"variable":"x_a"},{"body":[{"type":"let","value":5131,"variable":"x_a"},{"payload":"p_owsbefgq","type":"nop"}],"kind":"func","name":"n_upwzfqyf","type":"scope"},{"body":[{"body":[{"type":"let","value":7291,"variable":"x_a"},{"body":[{"type":"let","value":9218,"variable":"x_a"},{"body":[{"type":"let","value":8538,"variable":"x_a"},{"body":[{"type":"let","value":5788,"variable":"x_a"},{"body":[{"type":"let","value":3396,"variable":"x_a"},{"body":[{"type":"let","value":2233,"variable":"x_a"},{"body":[{"type":"let","value":8355,"variable":"x_a"},{"body":[{"type":"let","value":2656,"variable":"x_a"},{"payload":"p_onnxjamj","type":"nop"},{"payload":"p_frxgiolc","type":"nop"},{"payload":"p_ubzonkgj","type":"nop"},{"payload":"p_eqpycbad","type":"nop"},{"payload":"p_aujkpdxj","type":"nop"},{"payload":"p_gkvocuit","type":"nop"},{"payload":"p_efinmxgg","type":"nop"},{"payload":"p_hcjwupmx","type":"nop"},{"payload":"p_figdefsq","type":"nop"},{"payload":"p_dtqrrapf","type":"nop"},{"payload":"p_ecnuseyb","type":"nop"},{"payload":"p_wxiqwsck","type":"nop"},{"payload":"p_qtbpdsoy","type":"nop"},{"payload":"p_oeguirav","type":"nop"},{"payload":"p_uggwmfxk","type":"nop"},{"payload":"p_kpovtwjk","type":"nop"},{"payload":"p_lppgnfps","type":"nop"},{"payload":"p_efhxkukn","type":"nop"},{"payload":"p_sanmddhi","type":"nop"},{"payload":"p_siryuwdh","type":"nop"},{"payload":"p_mbqjonui","type":"nop"},{"payload":"p_lvrxduio","type":"nop"},{"payload":"p_ayqccncx","type":"nop"},{"payload":"p_ahxbbhlk","type":"nop"},{"payload":"p_crsfwuhg","type":"nop"},{"payload":"p_nselhnfn","type":"nop"},{"payload":"p_ycbdlwxt","type":"nop"},{"payload":"p_ngqpxdbf","type":"nop"},{"payload":"p_ojjwihjw","type":"nop"},{"payload":"p_xowtrwey","type":"nop"},{"payload":"p_aveuufdl","type":"nop"},{"payload":"p_twdzdvgq","type":"nop"}],"kind":"func","name":"n_srzccekx","type":"scope"}],"kind":"unit","name":"n_nyhhhwls","type":"scope"}],"kind":"func","name":"n_jadtddlt","type":"scope"}],"kind":"area","name":"n_zhjajpre","type":"scope"}],"kind":"func","name":"n_umaaxcsp","type":"scope"}],"kind":"unit","name":"n_ysejfqil","type":"scope"}],"kind":"area","name":"n_xxsoyslo","type":"scope"}],"kind":"func","name":"n_avlmxvdp","type":"scope"}],"kind":"area","name":"n_nkxspaer","type":"scope"}],"kind":"area","name":"n_rqwrxyui","type":"scope"}],"kind":"unit","name":"n_siiguwcc","type":"scope"}],"kind":"unit","name":"n_ckeyqrqa","type":"scope"}],"kind":"func","name":"n_abociuel","type":"scope"}],"kind":"area","name":"n_xulpdezg","type":"scope"}],"kind":"func","name":"n_bxkklsuc","type":"scope"}],"kind":"area","name":"n_lojkqwkh","type":"scope"}]}`.

AST diagnostics: ast_error_code=invalid_json, ast_error_path=$.

Input:

Full input: [failure-inputs/b5c8dfdb763ced4dc4235fc03c2d64abad7cf3e1cb3fc070a1a3413c76284c16.txt](failure-inputs/b5c8dfdb763ced4dc4235fc03c2d64abad7cf3e1cb3fc070a1a3413c76284c16.txt). Excerpt lines 1–40 of 331:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Parse the complete program into its neutral JSON abstract syntax tree.
Preserve every node, parent-child relationship, statement order, scope kind and name, variable and value, and nop payload.
Do not evaluate bindings or discard shadowed bindings or nop statements.
The root is a JSON object with exactly one field, body, containing an ordered array of statements.
A scope node has exactly these fields: {"type":"scope","kind":"func","name":"n_abcdefgh","body":[]}.
Its kind is the semantic category unit, func, or area, using the mapping in SYNTAX even when the input keywords differ.
A binding node has exactly these fields: {"type":"let","variable":"x_a","value":1739}.
A nop node has exactly these fields: {"type":"nop","payload":"p_abcdefgh"}.
Use the actual names, variables, integer values and payloads from the input, not these illustrative schema values.
Closing lines determine the end of a scope body and do not create AST nodes.
Object field order and whitespace may vary; body-array order must match the source statement order.
Return only the complete JSON AST, without Markdown fences or explanation.

SYNTAX
The kind keywords are unit for unit, func for func, and area for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with end on its own line.
KIND is one of unit, func, area; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is let VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is nop PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
Program:
let x_b 1898
let x_a 9018
area n_imcgrbkz
let x_a 7207
nop p_qdggfdxg
end
area n_kamcsxht
let x_a 8346
func n_iqloaety
let x_a 7330
nop p_eeughnii
end
```

Raw answer:

```
{"body":[{"type":"let","variable":"x_a","value":1652},{"type":"scope","kind":"area","name":"n_gvigbimq","body":[{"type":"let","variable":"x_a","value":7671},{"type":"nop","payload":"p_kkqbfacm"}]},{"type":"scope","kind":"area","name":"n_lojkqwkh","body":[{"type":"let","variable":"x_a","value":1663},{"type":"scope","kind":"func","name":"n_bxkklsuc","body":[{"type":"let","variable":"x_a","value":3110},{"type":"scope","kind":"area","name":"n_xulpdezg","body":[{"type":"let","variable":"x_a","value":3968},{"type":"scope","kind":"func","name":"n_abociuel","body":[{"type":"let","variable":"x_a","value":3414},{"type":"scope","kind":"unit","name":"n_ckeyqrqa","body":[{"type":"let","variable":"x_a","value":1945},{"type":"scope","kind":"unit","name":"n_siiguwcc","body":[{"type":"let","variable":"x_a","value":1630},{"type":"scope","kind":"area","name":"n_rqwrxyui","body":[{"type":"let","variable":"x_a","value":4191},{"type":"scope","kind":"func","name":"n_upwzfqyf","body":[{"type":"let","variable":"x_a","value":5131},{"type":"nop","payload":"p_owsbefgq"}]},{"type":"scope","kind":"area","name":"n_nkxspaer","body":[{"type":"scope","kind":"func","name":"n_avlmxvdp","body":[{"type":"let","variable":"x_a","value":7291},{"type":"scope","kind":"area","name":"n_xxsoyslo","body":[{"type":"let","variable":"x_a","value":9218},{"type":"scope","kind":"unit","name":"n_ysejfqil","body":[{"type":"let","variable":"x_a","value":8538},{"type":"scope","kind":"func","name":"n_umaaxcsp","body":[{"type":"let","variable":"x_a","value":5788},{"type":"scope","kind":"area","name":"n_zhjajpre","body":[{"type":"let","variable":"x_a","value":3396},{"type":"scope","kind":"func","name":"n_jadtddlt","body":[{"type":"let","variable":"x_a","value":2233},{"type":"scope","kind":"unit","name":"n_nyhhhwls","body":[{"type":"let","variable":"x_a","value":8355},{"type":"scope","kind":"func","name":"n_srzccekx","body":[{"type":"let","variable":"x_a","value":2656},{"type":"nop","payload":"p_onnxjamj"},{"type":"nop","payload":"p_frxgiolc"},{"type":"nop","payload":"p_ubzonkgj"},{"type":"nop","payload":"p_eqpycbad"},{"type":"nop","payload":"p_aujkpdxj"},{"type":"nop","payload":"p_gkvocuit"},{"type":"nop","payload":"p_efinmxgg"},{"type":"nop","payload":"p_hcjwupmx"},{"type":"nop","payload":"p_figdefsq"},{"type":"nop","payload":"p_dtqrrapf"},{"type":"nop","payload":"p_ecnuseyb"},{"type":"nop","payload":"p_wxiqwsck"},{"type":"nop","payload":"p_qtbpdsoy"},{"type":"nop","payload":"p_oeguirav"},{"type":"nop","payload":"p_uggwmfxk"},{"type":"nop","payload":"p_kpovtwjk"},{"type":"nop","payload":"p_lppgnfps"},{"type":"nop","payload":"p_efhxkukn"},{"type":"nop","payload":"p_sanmddhi"},{"type":"nop","payload":"p_siryuwdh"},{"type":"nop","payload":"p_mbqjonui"},{"type":"nop","payload":"p_lvrxduio"},{"type":"nop","payload":"p_ayqccncx"},{"type":"nop","payload":"p_ahxbbhlk"},{"type":"nop","payload":"p_crsfwuhg"},{"type":"nop","payload":"p_nselhnfn"},{"type":"nop","payload":"p_ycbdlwxt"},{"type":"nop","payload":"p_ngqpxdbf"},{"type":"nop","payload":"p_ojjwihjw"},{"type":"nop","payload":"p_xowtrwey"},{"type":"nop","payload":"p_aveuufdl"},{"type":"nop","payload":"p_twdzdvgq"}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}
```

**named_end**; trial `21cb7a968e792a4d0c42e1efc7b12ef2f5d566a510b95662f3f8658ccf5531a9`; outcome `invalid_answer_format`; gold `{"body":[{"type":"let","value":7.78E+3,"variable":"x_a"},{"body":[{"type":"let","value":4588,"variable":"x_a"},{"payload":"p_arplgvty","type":"nop"}],"kind":"unit","name":"n_xzruieol","type":"scope"},{"body":[{"type":"let","value":3951,"variable":"x_a"},{"body":[{"type":"let","value":8355,"variable":"x_a"},{"body":[{"type":"let","value":6853,"variable":"x_a"},{"body":[{"type":"let","value":1494,"variable":"x_a"},{"body":[{"type":"let","value":1115,"variable":"x_a"},{"body":[{"type":"let","value":8272,"variable":"x_a"},{"body":[{"type":"let","value":1693,"variable":"x_a"},{"body":[{"type":"let","value":2888,"variable":"x_a"},{"payload":"p_wywarfdw","type":"nop"}],"kind":"unit","name":"n_uwcxlvqx","type":"scope"},{"body":[{"type":"let","value":3234,"variable":"x_a"},{"body":[{"type":"let","value":8232,"variable":"x_a"},{"body":[{"type":"let","value":6521,"variable":"x_a"},{"body":[{"type":"let","value":5513,"variable":"x_a"},{"body":[{"type":"let","value":6379,"variable":"x_a"},{"body":[{"type":"let","value":9905,"variable":"x_a"},{"body":[{"type":"let","value":2285,"variable":"x_a"},{"body":[{"type":"let","value":3428,"variable":"x_a"},{"body":[{"type":"let","value":5771,"variable":"x_a"},{"payload":"p_xtwqnerj","type":"nop"},{"payload":"p_flvwbokb","type":"nop"},{"payload":"p_wercvlhu","type":"nop"},{"payload":"p_vggimzyy","type":"nop"},{"payload":"p_ovfrunal","type":"nop"},{"payload":"p_sfrqivcs","type":"nop"},{"payload":"p_zzatkjav","type":"nop"},{"payload":"p_bagedhgh","type":"nop"}],"kind":"area","name":"n_bbnnfhel","type":"scope"}],"kind":"area","name":"n_szcnntya","type":"scope"}],"kind":"unit","name":"n_wxjyssgd","type":"scope"}],"kind":"area","name":"n_bsosxgag","type":"scope"}],"kind":"func","name":"n_jwciurnb","type":"scope"}],"kind":"unit","name":"n_uwistdnh","type":"scope"}],"kind":"unit","name":"n_mivamkpm","type":"scope"}],"kind":"unit","name":"n_qyafxfae","type":"scope"}],"kind":"area","name":"n_occddhfr","type":"scope"}],"kind":"area","name":"n_fkkjpdue","type":"scope"}],"kind":"area","name":"n_jfqgbwum","type":"scope"}],"kind":"unit","name":"n_alzdxmyg","type":"scope"}],"kind":"unit","name":"n_qxcmlyux","type":"scope"}],"kind":"func","name":"n_tnfgmedt","type":"scope"}],"kind":"unit","name":"n_aizbpjbd","type":"scope"}],"kind":"unit","name":"n_hknxsmte","type":"scope"}]}`.

AST diagnostics: ast_error_code=invalid_json, ast_error_path=$.

Input:

Full input: [failure-inputs/21cb7a968e792a4d0c42e1efc7b12ef2f5d566a510b95662f3f8658ccf5531a9.txt](failure-inputs/21cb7a968e792a4d0c42e1efc7b12ef2f5d566a510b95662f3f8658ccf5531a9.txt). Excerpt lines 1–40 of 308:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Parse the complete program into its neutral JSON abstract syntax tree.
Preserve every node, parent-child relationship, statement order, scope kind and name, variable and value, and nop payload.
Do not evaluate bindings or discard shadowed bindings or nop statements.
The root is a JSON object with exactly one field, body, containing an ordered array of statements.
A scope node has exactly these fields: {"type":"scope","kind":"func","name":"n_abcdefgh","body":[]}.
Its kind is the semantic category unit, func, or area, using the mapping in SYNTAX even when the input keywords differ.
A binding node has exactly these fields: {"type":"let","variable":"x_a","value":1739}.
A nop node has exactly these fields: {"type":"nop","payload":"p_abcdefgh"}.
Use the actual names, variables, integer values and payloads from the input, not these illustrative schema values.
Closing lines determine the end of a scope body and do not create AST nodes.
Object field order and whitespace may vary; body-array order must match the source statement order.
Return only the complete JSON AST, without Markdown fences or explanation.

SYNTAX
The kind keywords are unit for unit, func for func, and area for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with end KIND NAME on one line. KIND and NAME must repeat that block's opening keyword and name.
KIND is one of unit, func, area; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is let VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is nop PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
Program:
let x_b 1898
let x_a 9018
area n_imcgrbkz
let x_a 7207
nop p_qdggfdxg
end area n_imcgrbkz
area n_kamcsxht
let x_a 8346
func n_iqloaety
let x_a 7330
nop p_eeughnii
end func n_iqloaety
```

Raw answer:

```
{"body":[{"type":"let","variable":"x_a","value":7780},{"type":"scope","kind":"unit","name":"n_xzruieol","body":[{"type":"let","variable":"x_a","value":4588},{"type":"nop","payload":"p_arplgvty"}]},{"type":"scope","kind":"unit","name":"n_hknxsmte","body":[{"type":"let","variable":"x_a","value":3951},{"type":"scope","kind":"unit","name":"n_aizbpjbd","body":[{"type":"let","variable":"x_a","value":8355},{"type":"scope","kind":"func","name":"n_tnfgmedt","body":[{"type":"let","variable":"x_a","value":6853},{"type":"scope","kind":"unit","name":"n_qxcmlyux","body":[{"type":"let","variable":"x_a","value":1494},{"type":"scope","kind":"unit","name":"n_alzdxmyg","body":[{"type":"let","variable":"x_a","value":1115},{"type":"scope","kind":"area","name":"n_jfqgbwum","body":[{"type":"let","variable":"x_a","value":8272},{"type":"scope","kind":"area","name":"n_fkkjpdue","body":[{"type":"let","variable":"x_a","value":1693},{"type":"scope","kind":"unit","name":"n_uwcxlvqx","body":[{"type":"let","variable":"x_a","value":2888},{"type":"nop","payload":"p_wywarfdw"}]},{"type":"scope","kind":"area","name":"n_occddhfr","body":[{"type":"let","variable":"x_a","value":3234},{"type":"scope","kind":"unit","name":"n_qyafxfae","body":[{"type":"let","variable":"x_a","value":8232},{"type":"scope","kind":"unit","name":"n_mivamkpm","body":[{"type":"let","variable":"x_a","value":6521},{"type":"scope","kind":"unit","name":"n_uwistdnh","body":[{"type":"let","variable":"x_a","value":5513},{"type":"scope","kind":"func","name":"n_jwciurnb","body":[{"type":"let","variable":"x_a","value":6379},{"type":"scope","kind":"area","name":"n_bsosxgag","body":[{"type":"let","variable":"x_a","value":9905},{"type":"scope","kind":"unit","name":"n_wxjyssgd","body":[{"type":"let","variable":"x_a","value":2285},{"type":"scope","kind":"area","name":"n_szcnntya","body":[{"type":"let","variable":"x_a","value":3428},{"type":"scope","kind":"area","name":"n_bbnnfhel","body":[{"type":"let","variable":"x_a","value":5771},{"type":"nop","payload":"p_xtwqnerj"},{"type":"nop","payload":"p_flvwbokb"},{"type":"nop","payload":"p_wercvlhu"},{"type":"nop","payload":"p_vggimzyy"},{"type":"nop","payload":"p_ovfrunal"},{"type":"nop","payload":"p_sfrqivcs"},{"type":"nop","payload":"p_zzatkjav"},{"type":"nop","payload":"p_bagedhgh"}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}
```

**generic_end**; trial `de97d66bfd083b3ad15d7cad503e593c3694b6e0e731af46137fa86cb49af73f`; outcome `invalid_answer_format`; gold `{"body":[{"type":"let","value":7.78E+3,"variable":"x_a"},{"body":[{"type":"let","value":4588,"variable":"x_a"},{"payload":"p_arplgvty","type":"nop"}],"kind":"unit","name":"n_xzruieol","type":"scope"},{"body":[{"type":"let","value":3951,"variable":"x_a"},{"body":[{"type":"let","value":8355,"variable":"x_a"},{"body":[{"type":"let","value":6853,"variable":"x_a"},{"body":[{"type":"let","value":1494,"variable":"x_a"},{"body":[{"type":"let","value":1115,"variable":"x_a"},{"body":[{"type":"let","value":8272,"variable":"x_a"},{"body":[{"type":"let","value":1693,"variable":"x_a"},{"body":[{"type":"let","value":2888,"variable":"x_a"},{"payload":"p_wywarfdw","type":"nop"}],"kind":"unit","name":"n_uwcxlvqx","type":"scope"},{"body":[{"type":"let","value":3234,"variable":"x_a"},{"body":[{"type":"let","value":8232,"variable":"x_a"},{"body":[{"type":"let","value":6521,"variable":"x_a"},{"body":[{"type":"let","value":5513,"variable":"x_a"},{"body":[{"type":"let","value":6379,"variable":"x_a"},{"body":[{"type":"let","value":9905,"variable":"x_a"},{"body":[{"type":"let","value":2285,"variable":"x_a"},{"body":[{"type":"let","value":3428,"variable":"x_a"},{"body":[{"type":"let","value":5771,"variable":"x_a"},{"payload":"p_xtwqnerj","type":"nop"},{"payload":"p_flvwbokb","type":"nop"},{"payload":"p_wercvlhu","type":"nop"},{"payload":"p_vggimzyy","type":"nop"},{"payload":"p_ovfrunal","type":"nop"},{"payload":"p_sfrqivcs","type":"nop"},{"payload":"p_zzatkjav","type":"nop"},{"payload":"p_bagedhgh","type":"nop"}],"kind":"area","name":"n_bbnnfhel","type":"scope"}],"kind":"area","name":"n_szcnntya","type":"scope"}],"kind":"unit","name":"n_wxjyssgd","type":"scope"}],"kind":"area","name":"n_bsosxgag","type":"scope"}],"kind":"func","name":"n_jwciurnb","type":"scope"}],"kind":"unit","name":"n_uwistdnh","type":"scope"}],"kind":"unit","name":"n_mivamkpm","type":"scope"}],"kind":"unit","name":"n_qyafxfae","type":"scope"}],"kind":"area","name":"n_occddhfr","type":"scope"}],"kind":"area","name":"n_fkkjpdue","type":"scope"}],"kind":"area","name":"n_jfqgbwum","type":"scope"}],"kind":"unit","name":"n_alzdxmyg","type":"scope"}],"kind":"unit","name":"n_qxcmlyux","type":"scope"}],"kind":"func","name":"n_tnfgmedt","type":"scope"}],"kind":"unit","name":"n_aizbpjbd","type":"scope"}],"kind":"unit","name":"n_hknxsmte","type":"scope"}]}`.

AST diagnostics: ast_error_code=invalid_json, ast_error_path=$.

Input:

Full input: [failure-inputs/de97d66bfd083b3ad15d7cad503e593c3694b6e0e731af46137fa86cb49af73f.txt](failure-inputs/de97d66bfd083b3ad15d7cad503e593c3694b6e0e731af46137fa86cb49af73f.txt). Excerpt lines 1–40 of 308:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Parse the complete program into its neutral JSON abstract syntax tree.
Preserve every node, parent-child relationship, statement order, scope kind and name, variable and value, and nop payload.
Do not evaluate bindings or discard shadowed bindings or nop statements.
The root is a JSON object with exactly one field, body, containing an ordered array of statements.
A scope node has exactly these fields: {"type":"scope","kind":"func","name":"n_abcdefgh","body":[]}.
Its kind is the semantic category unit, func, or area, using the mapping in SYNTAX even when the input keywords differ.
A binding node has exactly these fields: {"type":"let","variable":"x_a","value":1739}.
A nop node has exactly these fields: {"type":"nop","payload":"p_abcdefgh"}.
Use the actual names, variables, integer values and payloads from the input, not these illustrative schema values.
Closing lines determine the end of a scope body and do not create AST nodes.
Object field order and whitespace may vary; body-array order must match the source statement order.
Return only the complete JSON AST, without Markdown fences or explanation.

SYNTAX
The kind keywords are unit for unit, func for func, and area for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with end on its own line.
KIND is one of unit, func, area; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is let VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is nop PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
Program:
let x_b 1898
let x_a 9018
area n_imcgrbkz
let x_a 7207
nop p_qdggfdxg
end
area n_kamcsxht
let x_a 8346
func n_iqloaety
let x_a 7330
nop p_eeughnii
end
```

Raw answer:

```
{"body":[{"type":"let","variable":"x_a","value":7780},{"type":"scope","kind":"unit","name":"n_xzruieol","body":[{"type":"let","variable":"x_a","value":4588},{"type":"nop","payload":"p_arplgvty"}]},{"type":"scope","kind":"unit","name":"n_hknxsmte","body":[{"type":"let","variable":"x_a","value":3951},{"type":"scope","kind":"unit","name":"n_aizbpjbd","body":[{"type":"let","variable":"x_a","value":8355},{"type":"scope","kind":"func","name":"n_tnfgmedt","body":[{"type":"let","variable":"x_a","value":6853},{"type":"scope","kind":"unit","name":"n_qxcmlyux","body":[{"type":"let","variable":"x_a","value":1494},{"type":"scope","kind":"unit","name":"n_alzdxmyg","body":[{"type":"let","variable":"x_a","value":1115},{"type":"scope","kind":"area","name":"n_jfqgbwum","body":[{"type":"let","variable":"x_a","value":8272},{"type":"scope","kind":"area","name":"n_fkkjpdue","body":[{"type":"let","variable":"x_a","value":1693},{"type":"scope","kind":"unit","name":"n_uwcxlvqx","body":[{"type":"let","variable":"x_a","value":2888},{"type":"nop","payload":"p_wywarfdw"}]},{"type":"scope","kind":"area","name":"n_occddhfr","body":[{"type":"let","variable":"x_a","value":3234},{"type":"scope","kind":"unit","name":"n_qyafxfae","body":[{"type":"let","variable":"x_a","value":8232},{"type":"scope","kind":"unit","name":"n_mivamkpm","body":[{"type":"let","variable":"x_a","value":6521},{"type":"scope","kind":"unit","name":"n_uwistdnh","body":[{"type":"let","variable":"x_a","value":5513},{"type":"scope","kind":"func","name":"n_jwciurnb","body":[{"type":"let","variable":"x_a","value":6379},{"type":"scope","kind":"area","name":"n_bsosxgag","body":[{"type":"let","variable":"x_a","value":9905},{"type":"scope","kind":"unit","name":"n_wxjyssgd","body":[{"type":"let","variable":"x_a","value":2285},{"type":"scope","kind":"area","name":"n_szcnntya","body":[{"type":"let","variable":"x_a","value":3428},{"type":"scope","kind":"area","name":"n_bbnnfhel","body":[{"type":"let","variable":"x_a","value":5771},{"type":"nop","payload":"p_xtwqnerj"},{"type":"nop","payload":"p_flvwbokb"},{"type":"nop","payload":"p_wercvlhu"},{"type":"nop","payload":"p_vggimzyy"},{"type":"nop","payload":"p_ovfrunal"},{"type":"nop","payload":"p_sfrqivcs"},{"type":"nop","payload":"p_zzatkjav"},{"type":"nop","payload":"p_bagedhgh"}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}
```

**named_end**; trial `7728b9d1beb8f747d54312a741e9dc6107b0620b877878d8ed1a10e181223b5d`; outcome `invalid_answer_format`; gold `{"body":[{"type":"let","value":6841,"variable":"x_a"},{"body":[{"type":"let","value":3169,"variable":"x_a"},{"payload":"p_hlnzajxz","type":"nop"}],"kind":"area","name":"n_aogrngaq","type":"scope"},{"body":[{"type":"let","value":7274,"variable":"x_a"},{"body":[{"type":"let","value":9106,"variable":"x_a"},{"body":[{"type":"let","value":2808,"variable":"x_a"},{"body":[{"type":"let","value":5562,"variable":"x_a"},{"body":[{"type":"let","value":1383,"variable":"x_a"},{"body":[{"type":"let","value":7268,"variable":"x_a"},{"body":[{"type":"let","value":7232,"variable":"x_a"},{"body":[{"type":"let","value":3152,"variable":"x_a"},{"payload":"p_tvhktbuy","type":"nop"}],"kind":"func","name":"n_ctwunaoq","type":"scope"},{"body":[{"type":"let","value":3055,"variable":"x_a"},{"body":[{"type":"let","value":3.07E+3,"variable":"x_a"},{"body":[{"type":"let","value":3949,"variable":"x_a"},{"body":[{"type":"let","value":5815,"variable":"x_a"},{"body":[{"type":"let","value":5389,"variable":"x_a"},{"body":[{"type":"let","value":9896,"variable":"x_a"},{"body":[{"type":"let","value":4845,"variable":"x_a"},{"body":[{"type":"let","value":3381,"variable":"x_a"},{"body":[{"type":"let","value":1003,"variable":"x_a"},{"payload":"p_hnrupvpa","type":"nop"},{"payload":"p_bmsalmxo","type":"nop"},{"payload":"p_rlgymkbt","type":"nop"},{"payload":"p_wctpwbbt","type":"nop"},{"payload":"p_tmbtuzfj","type":"nop"},{"payload":"p_muzozqdm","type":"nop"},{"payload":"p_ijnhuefv","type":"nop"},{"payload":"p_rvxoyjor","type":"nop"},{"payload":"p_bbguomfh","type":"nop"},{"payload":"p_zdnbmmpc","type":"nop"},{"payload":"p_jrcydako","type":"nop"},{"payload":"p_veyuxvtv","type":"nop"},{"payload":"p_jbjjrgbl","type":"nop"},{"payload":"p_xujohgtw","type":"nop"},{"payload":"p_xjcoduls","type":"nop"},{"payload":"p_xhwkcvsw","type":"nop"},{"payload":"p_hsyxonfz","type":"nop"},{"payload":"p_hhnmqkyw","type":"nop"},{"payload":"p_rtslrigu","type":"nop"},{"payload":"p_spzrngoc","type":"nop"},{"payload":"p_mvijgogu","type":"nop"},{"payload":"p_xrbxktui","type":"nop"},{"payload":"p_gogiprhm","type":"nop"},{"payload":"p_dpoaqgbz","type":"nop"},{"payload":"p_eykqipeq","type":"nop"},{"payload":"p_qobdkzny","type":"nop"},{"payload":"p_kfxckomj","type":"nop"},{"payload":"p_cwghfror","type":"nop"},{"payload":"p_qlymtpph","type":"nop"},{"payload":"p_vgxhdeep","type":"nop"},{"payload":"p_kvigmnlt","type":"nop"},{"payload":"p_oaingbdt","type":"nop"}],"kind":"func","name":"n_xswzrvul","type":"scope"}],"kind":"func","name":"n_tcarhfbf","type":"scope"}],"kind":"func","name":"n_ejmonzms","type":"scope"}],"kind":"area","name":"n_cpcdivuo","type":"scope"}],"kind":"area","name":"n_jsgzqmem","type":"scope"}],"kind":"func","name":"n_xkzgrucd","type":"scope"}],"kind":"func","name":"n_zzwiythh","type":"scope"}],"kind":"unit","name":"n_nrvpdgju","type":"scope"}],"kind":"area","name":"n_rzevmwyf","type":"scope"}],"kind":"func","name":"n_apqesvpo","type":"scope"}],"kind":"area","name":"n_uvbznsja","type":"scope"}],"kind":"area","name":"n_jurzmrha","type":"scope"}],"kind":"unit","name":"n_kfjsykiq","type":"scope"}],"kind":"unit","name":"n_vylcytpr","type":"scope"}],"kind":"unit","name":"n_bghiwyrj","type":"scope"}],"kind":"func","name":"n_jnnwfaip","type":"scope"}]}`.

AST diagnostics: ast_error_code=invalid_json, ast_error_path=$.

Input:

Full input: [failure-inputs/7728b9d1beb8f747d54312a741e9dc6107b0620b877878d8ed1a10e181223b5d.txt](failure-inputs/7728b9d1beb8f747d54312a741e9dc6107b0620b877878d8ed1a10e181223b5d.txt). Excerpt lines 1–40 of 332:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Parse the complete program into its neutral JSON abstract syntax tree.
Preserve every node, parent-child relationship, statement order, scope kind and name, variable and value, and nop payload.
Do not evaluate bindings or discard shadowed bindings or nop statements.
The root is a JSON object with exactly one field, body, containing an ordered array of statements.
A scope node has exactly these fields: {"type":"scope","kind":"func","name":"n_abcdefgh","body":[]}.
Its kind is the semantic category unit, func, or area, using the mapping in SYNTAX even when the input keywords differ.
A binding node has exactly these fields: {"type":"let","variable":"x_a","value":1739}.
A nop node has exactly these fields: {"type":"nop","payload":"p_abcdefgh"}.
Use the actual names, variables, integer values and payloads from the input, not these illustrative schema values.
Closing lines determine the end of a scope body and do not create AST nodes.
Object field order and whitespace may vary; body-array order must match the source statement order.
Return only the complete JSON AST, without Markdown fences or explanation.

SYNTAX
The kind keywords are unit for unit, func for func, and area for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with end KIND NAME on one line. KIND and NAME must repeat that block's opening keyword and name.
KIND is one of unit, func, area; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is let VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is nop PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
Program:
let x_b 1898
let x_a 9018
area n_imcgrbkz
let x_a 7207
nop p_qdggfdxg
end area n_imcgrbkz
area n_kamcsxht
let x_a 8346
func n_iqloaety
let x_a 7330
nop p_eeughnii
end func n_iqloaety
```

Raw answer:

```
{"body":[{"type":"let","variable":"x_a","value":6841},{"type":"scope","kind":"area","name":"n_aogrngaq","body":[{"type":"let","variable":"x_a","value":3169},{"type":"nop","payload":"p_hlnzajxz"}]},{"type":"scope","kind":"func","name":"n_jnnwfaip","body":[{"type":"let","variable":"x_a","value":7274},{"type":"scope","kind":"unit","name":"n_bghiwyrj","body":[{"type":"let","variable":"x_a","value":9106},{"type":"scope","kind":"unit","name":"n_vylcytpr","body":[{"type":"let","variable":"x_a","value":2808},{"type":"scope","kind":"unit","name":"n_kfjsykiq","body":[{"type":"let","variable":"x_a","value":5562},{"type":"scope","kind":"area","name":"n_jurzmrha","body":[{"type":"let","variable":"x_a","value":1383},{"type":"scope","kind":"area","name":"n_uvbznsja","body":[{"type":"let","variable":"x_a","value":7268},{"type":"scope","kind":"func","name":"n_apqesvpo","body":[{"type":"let","variable":"x_a","value":7232},{"type":"scope","kind":"func","name":"n_ctwunaoq","body":[{"type":"let","variable":"x_a","value":3152},{"type":"nop","payload":"p_tvhktbuy"}]},{"type":"scope","kind":"area","name":"n_rzevmwyf","body":[{"type":"let","variable":"x_a","value":3055},{"type":"scope","kind":"unit","name":"n_nrvpdgju","body":[{"type":"let","variable":"x_a","value":3070},{"type":"scope","kind":"func","name":"n_zzwiythh","body":[{"type":"let","variable":"x_a","value":3949},{"type":"scope","kind":"func","name":"n_xkzgrucd","body":[{"type":"let","variable":"x_a","value":5815},{"type":"scope","kind":"area","name":"n_jsgzqmem","body":[{"type":"let","variable":"x_a","value":5389},{"type":"scope","kind":"area","name":"n_cpcdivuo","body":[{"type":"let","variable":"x_a","value":9896},{"type":"scope","kind":"func","name":"n_ejmonzms","body":[{"type":"let","variable":"x_a","value":4845},{"type":"scope","kind":"func","name":"n_tcarhfbf","body":[{"type":"let","variable":"x_a","value":3381},{"type":"scope","kind":"func","name":"n_xswzrvul","body":[{"type":"let","variable":"x_a","value":1003},{"type":"nop","payload":"p_hnrupvpa"},{"type":"nop","payload":"p_bmsalmxo"},{"type":"nop","payload":"p_rlgymkbt"},{"type":"nop","payload":"p_wctpwbbt"},{"type":"nop","payload":"p_tmbtuzfj"},{"type":"nop","payload":"p_muzozqdm"},{"type":"nop","payload":"p_ijnhuefv"},{"type":"nop","payload":"p_rvxoyjor"},{"type":"nop","payload":"p_bbguomfh"},{"type":"nop","payload":"p_zdnbmmpc"},{"type":"nop","payload":"p_jrcydako"},{"type":"nop","payload":"p_veyuxvtv"},{"type":"nop","payload":"p_jbjjrgbl"},{"type":"nop","payload":"p_xujohgtw"},{"type":"nop","payload":"p_xjcoduls"},{"type":"nop","payload":"p_xhwkcvsw"},{"type":"nop","payload":"p_hsyxonfz"},{"type":"nop","payload":"p_hhnmqkyw"},{"type":"nop","payload":"p_rtslrigu"},{"type":"nop","payload":"p_spzrngoc"},{"type":"nop","payload":"p_mvijgogu"},{"type":"nop","payload":"p_xrbxktui"},{"type":"nop","payload":"p_gogiprhm"},{"type":"nop","payload":"p_dpoaqgbz"},{"type":"nop","payload":"p_eykqipeq"},{"type":"nop","payload":"p_qobdkzny"},{"type":"nop","payload":"p_kfxckomj"},{"type":"nop","payload":"p_cwghfror"},{"type":"nop","payload":"p_qlymtpph"},{"type":"nop","payload":"p_vgxhdeep"},{"type":"nop","payload":"p_kvigmnlt"},{"type":"nop","payload":"p_oaingbdt"}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}
```

**generic_end**; trial `fbf602931a8187c1c27aacceefd371ffe75d386367bff23673f43457a1d31f12`; outcome `invalid_answer_format`; gold `{"body":[{"type":"let","value":6841,"variable":"x_a"},{"body":[{"type":"let","value":3169,"variable":"x_a"},{"payload":"p_hlnzajxz","type":"nop"}],"kind":"area","name":"n_aogrngaq","type":"scope"},{"body":[{"type":"let","value":7274,"variable":"x_a"},{"body":[{"type":"let","value":9106,"variable":"x_a"},{"body":[{"type":"let","value":2808,"variable":"x_a"},{"body":[{"type":"let","value":5562,"variable":"x_a"},{"body":[{"type":"let","value":1383,"variable":"x_a"},{"body":[{"type":"let","value":7268,"variable":"x_a"},{"body":[{"type":"let","value":7232,"variable":"x_a"},{"body":[{"type":"let","value":3152,"variable":"x_a"},{"payload":"p_tvhktbuy","type":"nop"}],"kind":"func","name":"n_ctwunaoq","type":"scope"},{"body":[{"type":"let","value":3055,"variable":"x_a"},{"body":[{"type":"let","value":3.07E+3,"variable":"x_a"},{"body":[{"type":"let","value":3949,"variable":"x_a"},{"body":[{"type":"let","value":5815,"variable":"x_a"},{"body":[{"type":"let","value":5389,"variable":"x_a"},{"body":[{"type":"let","value":9896,"variable":"x_a"},{"body":[{"type":"let","value":4845,"variable":"x_a"},{"body":[{"type":"let","value":3381,"variable":"x_a"},{"body":[{"type":"let","value":1003,"variable":"x_a"},{"payload":"p_hnrupvpa","type":"nop"},{"payload":"p_bmsalmxo","type":"nop"},{"payload":"p_rlgymkbt","type":"nop"},{"payload":"p_wctpwbbt","type":"nop"},{"payload":"p_tmbtuzfj","type":"nop"},{"payload":"p_muzozqdm","type":"nop"},{"payload":"p_ijnhuefv","type":"nop"},{"payload":"p_rvxoyjor","type":"nop"},{"payload":"p_bbguomfh","type":"nop"},{"payload":"p_zdnbmmpc","type":"nop"},{"payload":"p_jrcydako","type":"nop"},{"payload":"p_veyuxvtv","type":"nop"},{"payload":"p_jbjjrgbl","type":"nop"},{"payload":"p_xujohgtw","type":"nop"},{"payload":"p_xjcoduls","type":"nop"},{"payload":"p_xhwkcvsw","type":"nop"},{"payload":"p_hsyxonfz","type":"nop"},{"payload":"p_hhnmqkyw","type":"nop"},{"payload":"p_rtslrigu","type":"nop"},{"payload":"p_spzrngoc","type":"nop"},{"payload":"p_mvijgogu","type":"nop"},{"payload":"p_xrbxktui","type":"nop"},{"payload":"p_gogiprhm","type":"nop"},{"payload":"p_dpoaqgbz","type":"nop"},{"payload":"p_eykqipeq","type":"nop"},{"payload":"p_qobdkzny","type":"nop"},{"payload":"p_kfxckomj","type":"nop"},{"payload":"p_cwghfror","type":"nop"},{"payload":"p_qlymtpph","type":"nop"},{"payload":"p_vgxhdeep","type":"nop"},{"payload":"p_kvigmnlt","type":"nop"},{"payload":"p_oaingbdt","type":"nop"}],"kind":"func","name":"n_xswzrvul","type":"scope"}],"kind":"func","name":"n_tcarhfbf","type":"scope"}],"kind":"func","name":"n_ejmonzms","type":"scope"}],"kind":"area","name":"n_cpcdivuo","type":"scope"}],"kind":"area","name":"n_jsgzqmem","type":"scope"}],"kind":"func","name":"n_xkzgrucd","type":"scope"}],"kind":"func","name":"n_zzwiythh","type":"scope"}],"kind":"unit","name":"n_nrvpdgju","type":"scope"}],"kind":"area","name":"n_rzevmwyf","type":"scope"}],"kind":"func","name":"n_apqesvpo","type":"scope"}],"kind":"area","name":"n_uvbznsja","type":"scope"}],"kind":"area","name":"n_jurzmrha","type":"scope"}],"kind":"unit","name":"n_kfjsykiq","type":"scope"}],"kind":"unit","name":"n_vylcytpr","type":"scope"}],"kind":"unit","name":"n_bghiwyrj","type":"scope"}],"kind":"func","name":"n_jnnwfaip","type":"scope"}]}`.

AST diagnostics: ast_error_code=invalid_json, ast_error_path=$.

Input:

Full input: [failure-inputs/fbf602931a8187c1c27aacceefd371ffe75d386367bff23673f43457a1d31f12.txt](failure-inputs/fbf602931a8187c1c27aacceefd371ffe75d386367bff23673f43457a1d31f12.txt). Excerpt lines 1–40 of 332:

```
Follow the task and return only the requested answer, without explanation or Markdown fences.
Parse the complete program into its neutral JSON abstract syntax tree.
Preserve every node, parent-child relationship, statement order, scope kind and name, variable and value, and nop payload.
Do not evaluate bindings or discard shadowed bindings or nop statements.
The root is a JSON object with exactly one field, body, containing an ordered array of statements.
A scope node has exactly these fields: {"type":"scope","kind":"func","name":"n_abcdefgh","body":[]}.
Its kind is the semantic category unit, func, or area, using the mapping in SYNTAX even when the input keywords differ.
A binding node has exactly these fields: {"type":"let","variable":"x_a","value":1739}.
A nop node has exactly these fields: {"type":"nop","payload":"p_abcdefgh"}.
Use the actual names, variables, integer values and payloads from the input, not these illustrative schema values.
Closing lines determine the end of a scope body and do not create AST nodes.
Object field order and whitespace may vary; body-array order must match the source statement order.
Return only the complete JSON AST, without Markdown fences or explanation.

SYNTAX
The kind keywords are unit for unit, func for func, and area for area. Each creates a local scope.
Open a block with KIND NAME on one line.
Close the innermost open block with end on its own line.
KIND is one of unit, func, area; NAME is n_ followed by exactly eight lowercase letters and is unique in the program.
A binding statement (let) is let VARIABLE VALUE. VARIABLE is x_ followed by one letter a through f; VALUE is a four digit integer from 1000 through 9999.
Within one scope a variable is bound at most once. Inner bindings hide outer bindings until their scope closes.
A no-effect statement (nop) is nop PAYLOAD. PAYLOAD is p_ followed by eight lowercase letters.
The observation marker is probe PROBE_ID VARIABLE. PROBE_ID is q_ followed by eight lowercase letters.
Use one statement per line. Indentation has no meaning; scope is determined solely by explicit opening and closing lines.

EXAMPLES
Example 1
Program:
let x_b 1898
let x_a 9018
area n_imcgrbkz
let x_a 7207
nop p_qdggfdxg
end
area n_kamcsxht
let x_a 8346
func n_iqloaety
let x_a 7330
nop p_eeughnii
end
```

Raw answer:

```
{"body":[{"type":"let","variable":"x_a","value":6841},{"type":"scope","kind":"area","name":"n_aogrngaq","body":[{"type":"let","variable":"x_a","value":3169},{"type":"nop","payload":"p_hlnzajxz"}]},{"type":"scope","kind":"func","name":"n_jnnwfaip","body":[{"type":"let","variable":"x_a","value":7274},{"type":"scope","kind":"unit","name":"n_bghiwyrj","body":[{"type":"let","variable":"x_a","value":9106},{"type":"scope","kind":"unit","name":"n_vylcytpr","body":[{"type":"let","variable":"x_a","value":2808},{"type":"scope","kind":"unit","name":"n_kfjsykiq","body":[{"type":"let","variable":"x_a","value":5562},{"type":"scope","kind":"area","name":"n_jurzmrha","body":[{"type":"let","variable":"x_a","value":1383},{"type":"scope","kind":"area","name":"n_uvbznsja","body":[{"type":"let","variable":"x_a","value":7268},{"type":"scope","kind":"func","name":"n_apqesvpo","body":[{"type":"let","variable":"x_a","value":7232},{"type":"scope","kind":"func","name":"n_ctwunaoq","body":[{"type":"let","variable":"x_a","value":3152},{"type":"nop","payload":"p_tvhktbuy"}]},{"type":"scope","kind":"area","name":"n_rzevmwyf","body":[{"type":"let","variable":"x_a","value":3055},{"type":"scope","kind":"unit","name":"n_nrvpdgju","body":[{"type":"let","variable":"x_a","value":3070},{"type":"scope","kind":"func","name":"n_zzwiythh","body":[{"type":"let","variable":"x_a","value":3949},{"type":"scope","kind":"func","name":"n_xkzgrucd","body":[{"type":"let","variable":"x_a","value":5815},{"type":"scope","kind":"area","name":"n_jsgzqmem","body":[{"type":"let","variable":"x_a","value":5389},{"type":"scope","kind":"area","name":"n_cpcdivuo","body":[{"type":"let","variable":"x_a","value":9896},{"type":"scope","kind":"func","name":"n_ejmonzms","body":[{"type":"let","variable":"x_a","value":4845},{"type":"scope","kind":"func","name":"n_tcarhfbf","body":[{"type":"let","variable":"x_a","value":3381},{"type":"scope","kind":"func","name":"n_xswzrvul","body":[{"type":"let","variable":"x_a","value":1003},{"type":"nop","payload":"p_hnrupvpa"},{"type":"nop","payload":"p_bmsalmxo"},{"type":"nop","payload":"p_rlgymkbt"},{"type":"nop","payload":"p_wctpwbbt"},{"type":"nop","payload":"p_tmbtuzfj"},{"type":"nop","payload":"p_muzozqdm"},{"type":"nop","payload":"p_ijnhuefv"},{"type":"nop","payload":"p_rvxoyjor"},{"type":"nop","payload":"p_bbguomfh"},{"type":"nop","payload":"p_zdnbmmpc"},{"type":"nop","payload":"p_jrcydako"},{"type":"nop","payload":"p_veyuxvtv"},{"type":"nop","payload":"p_jbjjrgbl"},{"type":"nop","payload":"p_xujohgtw"},{"type":"nop","payload":"p_xjcoduls"},{"type":"nop","payload":"p_xhwkcvsw"},{"type":"nop","payload":"p_hsyxonfz"},{"type":"nop","payload":"p_hhnmqkyw"},{"type":"nop","payload":"p_rtslrigu"},{"type":"nop","payload":"p_spzrngoc"},{"type":"nop","payload":"p_mvijgogu"},{"type":"nop","payload":"p_xrbxktui"},{"type":"nop","payload":"p_gogiprhm"},{"type":"nop","payload":"p_dpoaqgbz"},{"type":"nop","payload":"p_eykqipeq"},{"type":"nop","payload":"p_qobdkzny"},{"type":"nop","payload":"p_kfxckomj"},{"type":"nop","payload":"p_cwghfror"},{"type":"nop","payload":"p_qlymtpph"},{"type":"nop","payload":"p_vgxhdeep"},{"type":"nop","payload":"p_kvigmnlt"},{"type":"nop","payload":"p_oaingbdt"}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}]}
```


## 10. Limitations and next experiments

The benchmark tests explained miniature grammars plus fixed few-shot examples, not grammar learning from examples alone. The eight fixed nonce vocabularies do not represent every artificial vocabulary. Indentation is non-semantic; D/E character-length matching is not token matching.

Accuracy, token usage, reasoning usage, caching, and latency are observable task and service outcomes; they do not directly measure cognitive load, dependency distance inside a model, or FLOPs. First parse errors are not counts of every syntax error. Self-contained fences are auxiliary normalization only.

An observed zero or undetected difference does not prove general equivalence. Differences can reflect retrieval cues, delimiter identification, tokenization, or prompt length. Missingness, ceilings/floors, generation output burden, and method-specific measurement limits constrain causal explanations.

Follow-up candidates after a new preregistered holdout: indentation, same-kind nesting, number of examples, reasoning effort, repair tasks, local-window cuts, and input-token matching. Do not remove failures or stop when an interval first becomes favorable.