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   "witness": [
    7,
    10,
    31,
    36,
    41,
    43,
    53,
    58,
    64,
    79,
    82,
    99,
    109,
    110,
    117,
    119,
    120,
    132,
    149
   ]
  },
  "Z": {
   "value": 19,
   "confidence": "upper_bound",
   "witness": [
    12,
    16,
    20,
    23,
    32,
    37,
    46,
    56,
    77,
    90,
    109,
    112,
    121,
    127,
    152,
    155,
    171,
    173,
    186
   ]
  }
 },
 "provenance": {
  "authors": [
   "@MathysRennela"
  ],
  "construction": "contributed via qldpc submit",
  "origin": "submission",
  "date": "2026-09-18",
  "model": "DeepSeek V4 Flash 0731",
  "notes": "Literature reproduction of a published 2BGA code (arXiv:2306.16400; github.com/QEC-pages/2BGA-codes @ 403d194c3f98f0cadc236aecbc4a8b6139ccf23c). Checked against the live board: not equivalent to any existing entry."
 },
 "family": "generalized-bicycle"
}