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
unit n_zsweikhp
let x_a 5661
end unit n_zsweikhp
end area n_kamcsxht
AST:
{"body":[{"type":"let","value":1898,"variable":"x_b"},{"type":"let","value":9018,"variable":"x_a"},{"body":[{"type":"let","value":7207,"variable":"x_a"},{"payload":"p_qdggfdxg","type":"nop"}],"kind":"area","name":"n_imcgrbkz","type":"scope"},{"body":[{"type":"let","value":8346,"variable":"x_a"},{"body":[{"type":"let","value":7.33E+3,"variable":"x_a"},{"payload":"p_eeughnii","type":"nop"}],"kind":"func","name":"n_iqloaety","type":"scope"},{"body":[{"type":"let","value":5661,"variable":"x_a"}],"kind":"unit","name":"n_zsweikhp","type":"scope"}],"kind":"area","name":"n_kamcsxht","type":"scope"}]}

Example 2
Program:
let x_b 6809
let x_a 8528
area n_cltuwgfr
let x_a 7436
nop p_jnevfcow
end area n_cltuwgfr
func n_hjmowkks
func n_xgsdplot
let x_a 1433
nop p_fsvjabvb
end func n_xgsdplot
area n_prnbhatf
let x_a 4859
func n_xgfwoefi
let x_a 9856
nop p_bipumgzk
end func n_xgfwoefi
end area n_prnbhatf
end func n_hjmowkks
AST:
{"body":[{"type":"let","value":6809,"variable":"x_b"},{"type":"let","value":8528,"variable":"x_a"},{"body":[{"type":"let","value":7436,"variable":"x_a"},{"payload":"p_jnevfcow","type":"nop"}],"kind":"area","name":"n_cltuwgfr","type":"scope"},{"body":[{"body":[{"type":"let","value":1433,"variable":"x_a"},{"payload":"p_fsvjabvb","type":"nop"}],"kind":"func","name":"n_xgsdplot","type":"scope"},{"body":[{"type":"let","value":4859,"variable":"x_a"},{"body":[{"type":"let","value":9856,"variable":"x_a"},{"payload":"p_bipumgzk","type":"nop"}],"kind":"func","name":"n_xgfwoefi","type":"scope"}],"kind":"area","name":"n_prnbhatf","type":"scope"}],"kind":"func","name":"n_hjmowkks","type":"scope"}]}

Example 3
Program:
let x_b 4546
let x_a 4315
func n_qadbgcyx
let x_a 6944
nop p_ojcebpfp
end func n_qadbgcyx
area n_rhfrcekw
let x_a 4379
area n_ackhjhth
let x_a 4681
nop p_kiumvlki
end area n_ackhjhth
func n_pxnqtsdg
let x_a 5179
func n_fjetgddq
let x_a 1459
func n_nmzxtisc
let x_a 9594
nop p_jfpamrpj
nop p_rgdikjut
end func n_nmzxtisc
end func n_fjetgddq
end func n_pxnqtsdg
end area n_rhfrcekw
AST:
{"body":[{"type":"let","value":4546,"variable":"x_b"},{"type":"let","value":4315,"variable":"x_a"},{"body":[{"type":"let","value":6944,"variable":"x_a"},{"payload":"p_ojcebpfp","type":"nop"}],"kind":"func","name":"n_qadbgcyx","type":"scope"},{"body":[{"type":"let","value":4379,"variable":"x_a"},{"body":[{"type":"let","value":4681,"variable":"x_a"},{"payload":"p_kiumvlki","type":"nop"}],"kind":"area","name":"n_ackhjhth","type":"scope"},{"body":[{"type":"let","value":5179,"variable":"x_a"},{"body":[{"type":"let","value":1459,"variable":"x_a"},{"body":[{"type":"let","value":9594,"variable":"x_a"},{"payload":"p_jfpamrpj","type":"nop"},{"payload":"p_rgdikjut","type":"nop"}],"kind":"func","name":"n_nmzxtisc","type":"scope"}],"kind":"func","name":"n_fjetgddq","type":"scope"}],"kind":"func","name":"n_pxnqtsdg","type":"scope"}],"kind":"area","name":"n_rhfrcekw","type":"scope"}]}

Example 4
Program:
let x_b 5207
let x_a 3885
unit n_ktlkverx
let x_a 6602
nop p_gslvtmzu
end unit n_ktlkverx
func n_qoirzpkk
unit n_fkzkdvuv
let x_a 7615
nop p_ryjhouhq
end unit n_fkzkdvuv
area n_ukyxkutx
let x_a 1895
nop p_svnicwdv
nop p_ebipavym
nop p_reqpqjrs
end area n_ukyxkutx
end func n_qoirzpkk
AST:
{"body":[{"type":"let","value":5207,"variable":"x_b"},{"type":"let","value":3885,"variable":"x_a"},{"body":[{"type":"let","value":6602,"variable":"x_a"},{"payload":"p_gslvtmzu","type":"nop"}],"kind":"unit","name":"n_ktlkverx","type":"scope"},{"body":[{"body":[{"type":"let","value":7615,"variable":"x_a"},{"payload":"p_ryjhouhq","type":"nop"}],"kind":"unit","name":"n_fkzkdvuv","type":"scope"},{"body":[{"type":"let","value":1895,"variable":"x_a"},{"payload":"p_svnicwdv","type":"nop"},{"payload":"p_ebipavym","type":"nop"},{"payload":"p_reqpqjrs","type":"nop"}],"kind":"area","name":"n_ukyxkutx","type":"scope"}],"kind":"func","name":"n_qoirzpkk","type":"scope"}]}

Example 5
Program:
let x_b 2766
let x_a 1610
func n_gfudixmw
let x_a 2935
nop p_kvlbgeik
end func n_gfudixmw
unit n_gxfollqb
let x_a 9814
area n_cpzveext
let x_a 4727
nop p_vohnzzvv
end area n_cpzveext
func n_cionriid
let x_a 7140
func n_lyhdpyzi
let x_a 4247
nop p_bmzkvnzq
nop p_zdaufrur
nop p_zboxlivj
nop p_xliowxqj
end func n_lyhdpyzi
end func n_cionriid
end unit n_gxfollqb
AST:
{"body":[{"type":"let","value":2766,"variable":"x_b"},{"type":"let","value":1.61E+3,"variable":"x_a"},{"body":[{"type":"let","value":2935,"variable":"x_a"},{"payload":"p_kvlbgeik","type":"nop"}],"kind":"func","name":"n_gfudixmw","type":"scope"},{"body":[{"type":"let","value":9814,"variable":"x_a"},{"body":[{"type":"let","value":4727,"variable":"x_a"},{"payload":"p_vohnzzvv","type":"nop"}],"kind":"area","name":"n_cpzveext","type":"scope"},{"body":[{"type":"let","value":7.14E+3,"variable":"x_a"},{"body":[{"type":"let","value":4247,"variable":"x_a"},{"payload":"p_bmzkvnzq","type":"nop"},{"payload":"p_zdaufrur","type":"nop"},{"payload":"p_zboxlivj","type":"nop"},{"payload":"p_xliowxqj","type":"nop"}],"kind":"func","name":"n_lyhdpyzi","type":"scope"}],"kind":"func","name":"n_cionriid","type":"scope"}],"kind":"unit","name":"n_gxfollqb","type":"scope"}]}

Example 6
Program:
let x_b 4691
let x_a 6106
unit n_ndmozqvz
let x_a 8715
nop p_dzpekxyv
end unit n_ndmozqvz
unit n_jjeqyguo
let x_a 7168
area n_ebmmneso
let x_a 5166
nop p_xkunojzw
end area n_ebmmneso
func n_muypqkhe
func n_iimjvvgl
let x_a 1537
unit n_mfuypmsh
let x_a 2852
nop p_ulxdbrhn
nop p_pjpriolj
nop p_bytfzykt
nop p_cgvpkfje
nop p_risqwuuh
end unit n_mfuypmsh
end func n_iimjvvgl
end func n_muypqkhe
end unit n_jjeqyguo
AST:
{"body":[{"type":"let","value":4691,"variable":"x_b"},{"type":"let","value":6106,"variable":"x_a"},{"body":[{"type":"let","value":8715,"variable":"x_a"},{"payload":"p_dzpekxyv","type":"nop"}],"kind":"unit","name":"n_ndmozqvz","type":"scope"},{"body":[{"type":"let","value":7168,"variable":"x_a"},{"body":[{"type":"let","value":5166,"variable":"x_a"},{"payload":"p_xkunojzw","type":"nop"}],"kind":"area","name":"n_ebmmneso","type":"scope"},{"body":[{"body":[{"type":"let","value":1537,"variable":"x_a"},{"body":[{"type":"let","value":2852,"variable":"x_a"},{"payload":"p_ulxdbrhn","type":"nop"},{"payload":"p_pjpriolj","type":"nop"},{"payload":"p_bytfzykt","type":"nop"},{"payload":"p_cgvpkfje","type":"nop"},{"payload":"p_risqwuuh","type":"nop"}],"kind":"unit","name":"n_mfuypmsh","type":"scope"}],"kind":"func","name":"n_iimjvvgl","type":"scope"}],"kind":"func","name":"n_muypqkhe","type":"scope"}],"kind":"unit","name":"n_jjeqyguo","type":"scope"}]}

Example 7
Program:
let x_b 1986
let x_a 5784
func n_ummrqrxg
let x_a 7844
nop p_wcufesdb
end func n_ummrqrxg
func n_ynivrhvj
let x_a 5274
area n_eckgojog
let x_a 9034
nop p_ipbqefnk
end area n_eckgojog
area n_ejfvgsga
let x_a 3009
nop p_qzmmflrc
nop p_jwnvtybq
nop p_lvklijav
nop p_kbbfgwtw
nop p_fbtrlfld
nop p_gkxvrjso
end area n_ejfvgsga
end func n_ynivrhvj
AST:
{"body":[{"type":"let","value":1986,"variable":"x_b"},{"type":"let","value":5784,"variable":"x_a"},{"body":[{"type":"let","value":7844,"variable":"x_a"},{"payload":"p_wcufesdb","type":"nop"}],"kind":"func","name":"n_ummrqrxg","type":"scope"},{"body":[{"type":"let","value":5274,"variable":"x_a"},{"body":[{"type":"let","value":9034,"variable":"x_a"},{"payload":"p_ipbqefnk","type":"nop"}],"kind":"area","name":"n_eckgojog","type":"scope"},{"body":[{"type":"let","value":3009,"variable":"x_a"},{"payload":"p_qzmmflrc","type":"nop"},{"payload":"p_jwnvtybq","type":"nop"},{"payload":"p_lvklijav","type":"nop"},{"payload":"p_kbbfgwtw","type":"nop"},{"payload":"p_fbtrlfld","type":"nop"},{"payload":"p_gkxvrjso","type":"nop"}],"kind":"area","name":"n_ejfvgsga","type":"scope"}],"kind":"func","name":"n_ynivrhvj","type":"scope"}]}

Example 8
Program:
let x_b 9863
let x_a 7572
area n_xgurnmrs
let x_a 1384
nop p_jympynny
end area n_xgurnmrs
area n_bmjlhswg
area n_byeljvsd
let x_a 6584
nop p_ridfgvom
end area n_byeljvsd
area n_wmooegnc
let x_a 4308
unit n_sirozwri
let x_a 7107
nop p_kxpsrmub
nop p_nlquarhb
nop p_upeyzene
nop p_nazcxkpw
nop p_cewjhgle
nop p_kbnftnwh
nop p_yijhnzor
end unit n_sirozwri
end area n_wmooegnc
end area n_bmjlhswg
AST:
{"body":[{"type":"let","value":9863,"variable":"x_b"},{"type":"let","value":7572,"variable":"x_a"},{"body":[{"type":"let","value":1384,"variable":"x_a"},{"payload":"p_jympynny","type":"nop"}],"kind":"area","name":"n_xgurnmrs","type":"scope"},{"body":[{"body":[{"type":"let","value":6584,"variable":"x_a"},{"payload":"p_ridfgvom","type":"nop"}],"kind":"area","name":"n_byeljvsd","type":"scope"},{"body":[{"type":"let","value":4308,"variable":"x_a"},{"body":[{"type":"let","value":7107,"variable":"x_a"},{"payload":"p_kxpsrmub","type":"nop"},{"payload":"p_nlquarhb","type":"nop"},{"payload":"p_upeyzene","type":"nop"},{"payload":"p_nazcxkpw","type":"nop"},{"payload":"p_cewjhgle","type":"nop"},{"payload":"p_kbnftnwh","type":"nop"},{"payload":"p_yijhnzor","type":"nop"}],"kind":"unit","name":"n_sirozwri","type":"scope"}],"kind":"area","name":"n_wmooegnc","type":"scope"}],"kind":"area","name":"n_bmjlhswg","type":"scope"}]}

TEST
Program:
let x_a 2982
func n_qzetyjki
let x_a 8368
nop p_seupzpwi
end func n_qzetyjki
unit n_cposohdj
let x_a 2683
unit n_jixedkio
let x_a 9974
area n_zrygdkuv
let x_a 2630
area n_bmliozvb
let x_a 1765
area n_bbirpvtd
let x_a 4284
area n_rznbmqvo
let x_a 8576
func n_amvfzlqm
let x_a 8718
unit n_xfttmiwm
let x_a 8968
nop p_mlejbnli
end unit n_xfttmiwm
func n_zypipihb
func n_kqysyowm
let x_a 1099
unit n_hvyjavba
let x_a 5235
unit n_fuaeticc
let x_a 1255
area n_gqwavaaf
let x_a 6831
unit n_iofcmfzc
let x_a 6481
func n_xzedwrcp
let x_a 3232
area n_ffndxbxs
let x_a 9006
unit n_stoluheh
let x_a 9993
end unit n_stoluheh
end area n_ffndxbxs
end func n_xzedwrcp
end unit n_iofcmfzc
end area n_gqwavaaf
end unit n_fuaeticc
end unit n_hvyjavba
end func n_kqysyowm
end func n_zypipihb
end func n_amvfzlqm
end area n_rznbmqvo
end area n_bbirpvtd
end area n_bmliozvb
end area n_zrygdkuv
end unit n_jixedkio
end unit n_cposohdj
AST: