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   [
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   [
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   [
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   ],
   [
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   [
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   [
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   ],
   [
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   ]
  ]
 },
 "distance": {
  "d": 12,
  "X": {
   "value": 12,
   "confidence": "upper_bound",
   "witness": [
    50,
    57,
    69,
    76,
    86,
    98,
    105,
    150,
    159,
    176,
    191,
    220
   ]
  },
  "Z": {
   "value": 12,
   "confidence": "upper_bound",
   "witness": [
    27,
    32,
    39,
    49,
    66,
    91,
    114,
    155,
    174,
    187,
    191,
    219
   ]
  }
 },
 "provenance": {
  "authors": [
   "@MathysRennela",
   "Okada, Koki",
   "Kasai, Kenta",
   "Maskara, Nishad"
  ],
  "construction": "Pair-partition CPM/GPM CSS code (Okada-Kasai arXiv:2607.14091 catalogue), (J,L,P)=(3,8,31), check weight 8; H_X and H_Z taken verbatim from the published instance at https://kasai.ict.eng.isct.ac.jp/pair_partition_cpm_css_codes_data/contributed_codes/nishad_maskara/pp_248_66_12_cw8_P31.npz (sha256 5a08a30914596b6b1584a7a3d3e936b60bf8a08c962a1c19f39f966caec3701b), structure and distance re-verified here",
  "origin": "baseline",
  "date": "2026-09-29",
  "model": "Mimo-V2.6-Flash",
  "notes": "Literature reproduction of a published instance, not a new construction search. Equivalence checked against the board at submission time: no existing entry carries this (n,k) pair and nothing in the weight-8 unrestricted cell dominates it.",
  "novelty": "known_parameters",
  "references": [
   "arXiv:2607.14091"
  ]
 },
 "family": "pair-partition-cpm"
}