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   ]
  ]
 },
 "distance": {
  "d": 22,
  "X": {
   "value": 22,
   "confidence": "upper_bound",
   "witness": [
    2,
    5,
    8,
    16,
    21,
    29,
    45,
    48,
    64,
    72,
    80,
    88,
    90,
    93,
    98,
    104,
    106,
    117,
    129,
    161,
    202,
    210
   ]
  },
  "Z": {
   "value": 22,
   "confidence": "upper_bound",
   "witness": [
    5,
    28,
    116,
    117,
    124,
    126,
    129,
    134,
    137,
    150,
    153,
    156,
    161,
    166,
    180,
    185,
    188,
    190,
    209,
    222,
    230,
    238
   ]
  }
 },
 "provenance": {
  "authors": [
   "@simsaidan"
  ],
  "construction": "2BGA on metacyclic Z_15 x| Z_8 with r=4; supports a=[83, 21, 107, 116], b=[17, 20, 105, 97]. Found by sample_metacyclic sweep (order_range 40-150, weight 4, seed 44); see notes/240-6-22.md.",
  "references": [
   "arXiv:2306.16400"
  ],
  "origin": "submission",
  "date": "2026-09-05",
  "model": "Cursor Composer 2.5",
  "notes": "Witness-backed upper bound d<=22 (not exact-certified). Initial package claimed 24; CI refutation (seed 1806566679) found weight-22 X-logicals. Retightened both sides to weight-22 witnesses. Checked: not an exact/WL board duplicate."
 },
 "family": "generalized-bicycle"
}