{
 "schema_version": "0.1",
 "name": "[[18,2,5]]",
 "code_type": "CSS",
 "n": 18,
 "k": 2,
 "checks": {
  "X": [
   [
    5,
    6,
    15,
    17
   ],
   [
    3,
    4,
    7,
    14
   ],
   [
    0,
    9,
    10,
    11
   ],
   [
    1,
    2,
    13,
    16
   ],
   [
    0,
    4,
    5,
    7,
    8,
    9,
    15
   ],
   [
    1,
    2,
    4,
    5,
    8,
    14,
    17
   ],
   [
    0,
    2,
    7,
    8,
    10,
    14,
    16
   ],
   [
    0,
    3,
    4,
    5,
    11,
    12,
    17
   ]
  ],
  "Z": [
   [
    0,
    9,
    10,
    11
   ],
   [
    3,
    4,
    7,
    14
   ],
   [
    5,
    6,
    15,
    17
   ],
   [
    1,
    2,
    13,
    16
   ],
   [
    0,
    3,
    4,
    5,
    8,
    11,
    17
   ],
   [
    2,
    4,
    5,
    6,
    7,
    8,
    16
   ],
   [
    0,
    2,
    7,
    10,
    12,
    14,
    16
   ],
   [
    2,
    4,
    8,
    10,
    11,
    13,
    14
   ]
  ]
 },
 "distance": {
  "d": 5,
  "X": {
   "value": 5,
   "confidence": "upper_bound",
   "witness": [
    6,
    8,
    9,
    11,
    15
   ]
  },
  "Z": {
   "value": 5,
   "confidence": "upper_bound",
   "witness": [
    1,
    5,
    8,
    16,
    17
   ]
  }
 },
 "provenance": {
  "authors": [
   "@mathysrennela"
  ],
  "construction": "Reconstructed from qecdb.org record 6849a5e111ee4037d153b740 (https://qecdb.org/codes/6849a5e111ee4037d153b740); the record's H field is read as binary symplectic rows and split by rowspace (rank(A|B) = rank(A) + rank(B)), keeping the lightest independent basis of each part; n, k and the check weight recomputed here, witnesses from the kit's random search at the trials below. Database description: none; database distance claim d=5 (lower 5, upper 5).",
  "origin": "submission",
  "date": "2026-09-27",
  "model": "Mimo-V2.6-Free",
  "notes": "Equivalence assessed against the board: no exact stabilizer-group fingerprint match and no Weisfeiler-Leman signature match to any existing entry. Filed as `codes/18-2-5-b.json`, a lighter-check companion to `codes/18-2-5.json` (same [[18,2,5]], max check weight 7 vs 8)."
 },
 "family": "other"
}