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    70,
    88,
    135,
    159,
    191,
    229
   ],
   [
    11,
    53,
    71,
    89,
    136,
    160,
    192,
    230
   ]
  ]
 },
 "distance": {
  "d": 12,
  "X": {
   "value": 12,
   "confidence": "exact",
   "witness": [
    29,
    34,
    94,
    109,
    117,
    132,
    140,
    151,
    190,
    205,
    226,
    228
   ]
  },
  "Z": {
   "value": 12,
   "confidence": "exact",
   "witness": [
    0,
    3,
    50,
    60,
    63,
    112,
    118,
    128,
    157,
    174,
    177,
    231
   ]
  }
 },
 "provenance": {
  "authors": [
   "Maskara, Nishad"
  ],
  "origin": "baseline",
  "construction": "Cyclic pair-partition CPM CSS construction (arXiv:2607.14091), Nishad Maskara's contributed instance pp_232_62_12_cw8_P29: lift size P=29, (J,L)=(3,8), n=8*29=232, 87 checks per side, column weight 3, row weight 8, Tanner girth 6/6. Circulant-exponent arrays (J x L, one per side): E_x = [[4, 15, 26, 20, 2, 2, 28, 17], [14, 5, 12, 7, 27, 14, 0, 11], [23, 24, 25, 2, 14, 18, 20, 21]], E_z = [[0, 24, 2, 7, 27, 18, 4, 26], [24, 16, 17, 25, 8, 3, 5, 22], [17, 4, 15, 26, 8, 13, 10, 1]]. Reconstruction per the archive's own description: for block (i,j), Hx[i*29 + r, j*29 + ((r - E_x[i][j]) mod 29)] = 1 for r=0..28; Hz likewise from E_z. H_X and H_Z here are taken verbatim from the authors' archive https://kasai.ict.eng.isct.ac.jp/pair_partition_cpm_css_codes_data/contributed_codes/nishad_maskara/pp_232_62_12_cw8_P29.npz (sha256 260d1e15c179bd136560e557a6786bb240a4cfa8a5477347859b4b99c966dd6a), which is byte-identical to the certificate bundle's fixed input.",
  "date": "2026",
  "references": [
   "arXiv:2607.14091"
  ],
  "novelty": "known_parameters",
  "notes": "Literature baseline, seeded 2026-08-14. Listed as a Nishad Maskara contribution in the Okada-Kasai pair-partition CPM catalogue (arXiv:2607.14091; catalogue page updated 2026-08-13); the catalogue also lists an independent same-parameter instance PPS232 by Jong Yeon Lee with different circulant exponents, which is NOT this code and is not certified by the bundle below. The authors publish a machine-verified exact-distance certificate bundle for this instance (https://kasai.ict.eng.isct.ac.jp/pair_partition_cpm_css_codes_data/certificate_bundles_20260805/qc_232_62_12/certificate_bundle.tar.gz, status exact_distance_machine_verified in master_manifest.json), whose fixed input is byte-identical to the public npz: complete lower-bound coverage through weight 10 on both sides plus explicit weight-12 logicals, which are the witnesses here, re-verified in this repo (kernel membership, row-space non-membership). Marked exact on the strength of that public certificate; per board policy the entry still displays as an upper bound until this repo's own certification. Reproduction was validated end to end: the archive's H_X/H_Z match its documented exponent reconstruction exactly, are CSS-orthogonal, (3,8)-regular, with GF(2) ranks giving k=62. Discovery method of the contributed instance is undisclosed by the contributor; model provenance unknown."
 },
 "family": "pair-partition-cpm"
}