Follow the task and return only the requested answer, without explanation or Markdown fences.
You will read a prefix of a small scope language.
Every block, regardless of its kind, creates a local scope.
Statements are processed once, from top to bottom.
A let statement binds a variable in the current scope.
The nearest still-open scope containing the variable determines its value.
Bindings in closed scopes are no longer visible.
A nop statement has no effect.
The final probe marks the observation point.
Open blocks at the end of this prefix are intentional.
Do not complete or repair the program.
Return only a JSON array of the names of still-open blocks, ordered from outermost to innermost. Do not include the implicit global scope. If no blocks remain open, return [].

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 prefix:
let x_b 8303
let x_a 8323
unit n_qflwqmaz
let x_a 8435
nop p_zylqsrnu
end
func n_myndeesr
let x_a 8749
area n_inuktfag
let x_a 8459
nop p_mjpldyqb
end
area n_gqjdgjnv
let x_a 1433
end
probe q_mbifmxno x_a
Answer:
["n_myndeesr"]

Example 2
Program prefix:
let x_b 5135
let x_a 2841
unit n_dlopnmcd
let x_a 5739
nop p_jdgngrmp
end
unit n_wuovjpgb
area n_lmlpcznp
let x_a 3328
nop p_jmlgebbo
end
func n_mbcvettd
let x_a 8319
area n_tvzhhkqe
let x_a 8533
nop p_gqqmvtut
end
end
probe q_vghjmldk x_a
Answer:
["n_wuovjpgb"]

Example 3
Program prefix:
let x_b 2658
let x_a 4614
func n_bixyobtv
let x_a 7078
nop p_dtkmvpvr
end
area n_usknhpcf
let x_a 6538
unit n_qgrcybnz
let x_a 7274
nop p_hgnyeagk
end
area n_exzummid
let x_a 9011
unit n_eoooioqt
let x_a 7836
func n_dkndsizk
let x_a 6034
nop p_csjccxlz
nop p_mzxiyuyr
end
end
probe q_qvqijtlb x_a
Answer:
["n_usknhpcf","n_exzummid"]

Example 4
Program prefix:
let x_b 6521
let x_a 7590
area n_kpjszszc
let x_a 2928
nop p_gfasoglp
end
area n_wujpoest
unit n_tzvngvps
let x_a 2227
nop p_ustnyocf
end
func n_znlwyqda
let x_a 4748
nop p_rsplwwst
nop p_ncucklyp
nop p_rokkdkmd
end
probe q_cwnmrvbd x_a
Answer:
["n_wujpoest"]

Example 5
Program prefix:
let x_b 4895
let x_a 3433
unit n_hbzscaez
let x_a 8441
nop p_aovviwfe
end
func n_sboyihyp
let x_a 4773
area n_sqgwbfok
let x_a 7652
nop p_fhsrpsee
end
unit n_umvhgniv
let x_a 9613
area n_inpcwaxh
let x_a 2145
nop p_locndsoo
nop p_iketxzvy
nop p_tffyftuo
nop p_vydvhrbo
end
end
probe q_dmxteozh x_a
Answer:
["n_sboyihyp"]

Example 6
Program prefix:
let x_b 3276
let x_a 1754
func n_joiczzca
let x_a 5779
nop p_oxbqguog
end
unit n_anzlbrnx
let x_a 4413
unit n_ystzxxge
let x_a 6238
nop p_wxmwrcjq
end
func n_qtkxzmue
unit n_zsmpimdq
let x_a 8150
area n_dgjamytj
let x_a 9242
nop p_ujzetizq
nop p_ccbgqusp
nop p_nkanbitc
nop p_hevvoueq
nop p_rrfatpno
end
end
probe q_qajokgqb x_a
Answer:
["n_anzlbrnx","n_qtkxzmue"]

Example 7
Program prefix:
let x_b 7443
let x_a 6355
unit n_zxdgyyvi
let x_a 5676
nop p_jdukxssy
end
unit n_xuiwhuta
let x_a 1576
func n_olgkslrg
let x_a 1941
nop p_kwtlmpit
end
area n_hwyhzfrf
let x_a 5295
nop p_scovbznt
nop p_onqeacwn
nop p_nehwtdox
nop p_hholwlgn
nop p_mikvoxor
nop p_vbzqofyi
end
probe q_pwzdqhjp x_a
Answer:
["n_xuiwhuta"]

Example 8
Program prefix:
let x_b 4160
let x_a 7309
area n_bzmevtoc
let x_a 1696
nop p_rluwooen
end
func n_vdzbooul
func n_dnlrynce
let x_a 7518
nop p_trbnzure
end
func n_doqbvhfx
let x_a 1342
area n_elgiwzjy
let x_a 5955
nop p_jksdqoon
nop p_dniiynxi
nop p_nvdbfkqk
nop p_xbswmobw
nop p_axqwknam
nop p_awkvzpon
nop p_icsgsnrt
end
end
probe q_bxiftdqq x_a
Answer:
["n_vdzbooul"]

TEST
Program prefix:
let x_a 8709
area n_kvknhwdt
let x_a 4930
nop p_wehwcemo
end
func n_tiysyemf
let x_a 6984
area n_ctnihjws
let x_a 9052
unit n_ntxboeqs
let x_a 2892
func n_lumgpnyy
let x_a 8268
nop p_oequoaom
end
area n_ginlueac
func n_nyvdugjb
let x_a 6714
area n_lzfpiqih
let x_a 4596
func n_xufrurad
let x_a 4778
func n_gnauurox
let x_a 4651
nop p_xzyvketz
nop p_dvtzxkin
nop p_kmsodtun
nop p_xggqdvyt
nop p_micwvrmv
nop p_xrofrbmu
nop p_mmqigaav
nop p_ogpvpjbk
nop p_vcwqqwrm
nop p_siptsrum
nop p_wfpeukpa
nop p_jaaseuwp
nop p_otbxmsyv
nop p_xyiqxwtq
nop p_hkgsvdik
nop p_wbjvluml
nop p_wyeoojyr
nop p_nwcmxshj
nop p_lxiqgbis
nop p_flefapah
nop p_lhqirdrn
nop p_zlzepjfy
nop p_msaribao
nop p_oklsmpry
nop p_tednvtxi
nop p_trlabdcd
nop p_aigtwlew
nop p_hpadqupl
nop p_jhxopgyb
nop p_yedvuceh
nop p_adkxpwba
nop p_tdqmcvrl
end
end
end
end
probe q_hxmqaesr x_a
Answer: