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  ]
 },
 "distance": {
  "d": 9,
  "X": {
   "value": 9,
   "confidence": "upper_bound",
   "witness": [
    40,
    53,
    57,
    142,
    177,
    185,
    266,
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   ]
  },
  "Z": {
   "value": 9,
   "confidence": "upper_bound",
   "witness": [
    37,
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    60,
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    181
   ]
  }
 },
 "provenance": {
  "authors": [
   "@vprusso"
  ],
  "model": "Claude Opus 5",
  "novelty": "known_parameters",
  "origin": "submission",
  "date": "2026-09-21",
  "construction": "Check deletion from the board entry [[320,64,14]] (codes/320-64-14.json): rows [57, 123] of H_X removed. Dropping two independent stabiliser generators frees two logical qubits and cannot raise the distance.",
  "notes": "Found by sweeping every single-row deletion of every small board entry and keeping those that land undominated. The parent's remaining checks are unchanged."
 },
 "family": "check-deletion"
}