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    231
   ],
   [
    36,
    39,
    74,
    202,
    208,
    219
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   [
    40,
    55,
    75,
    189,
    194,
    220
   ],
   [
    38,
    41,
    76,
    180,
    181,
    221
   ],
   [
    22,
    42,
    114,
    222,
    225,
    237
   ],
   [
    9,
    43,
    78,
    204,
    211,
    223
   ],
   [
    0,
    44,
    79,
    188,
    205,
    224
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   [
    11,
    45,
    80,
    206,
    213,
    225
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   [
    43,
    46,
    81,
    190,
    207,
    226
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   [
    28,
    47,
    117,
    212,
    218,
    227
   ],
   [
    14,
    48,
    84,
    228,
    234,
    237
   ],
   [
    1,
    49,
    85,
    214,
    220,
    229
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   [
    16,
    50,
    86,
    199,
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    230
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   [
    48,
    51,
    87,
    182,
    185,
    231
   ],
   [
    2,
    52,
    91,
    198,
    217,
    232
   ],
   [
    21,
    53,
    92,
    218,
    224,
    233
   ],
   [
    4,
    54,
    93,
    200,
    219,
    234
   ],
   [
    5,
    55,
    97,
    225,
    230,
    235
   ],
   [
    27,
    56,
    98,
    211,
    217,
    236
   ],
   [
    7,
    57,
    99,
    188,
    193,
    237
   ],
   [
    10,
    58,
    104,
    212,
    229,
    238
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   [
    15,
    59,
    109,
    198,
    204,
    239
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  ]
 },
 "distance": {
  "d": 20,
  "X": {
   "value": 20,
   "confidence": "upper_bound",
   "witness": [
    16,
    27,
    30,
    35,
    50,
    66,
    69,
    90,
    113,
    123,
    126,
    128,
    130,
    133,
    145,
    147,
    155,
    173,
    184,
    236
   ]
  },
  "Z": {
   "value": 20,
   "confidence": "upper_bound",
   "witness": [
    13,
    14,
    30,
    34,
    60,
    107,
    117,
    133,
    135,
    152,
    153,
    176,
    177,
    183,
    194,
    212,
    213,
    234,
    236,
    237
   ]
  }
 },
 "provenance": {
  "authors": [
   "Rajpurohit, Rajendra Prasad",
   "Lalitha, V.",
   "Garani, Shayan Srinivasa",
   "@MathysRennela"
  ],
  "construction": "Coset lifted product (CLP) code of arXiv:2610.12782, Definition III.1, 1x1 over 2x2 layout: a protograph A over F_2[G] acting by the LEFT coset action of G on the cosets G/H, and a protograph B over F_2[N_G(H)] acting by the RIGHT coset action of the normaliser on the same cosets. G = SmallGroup(360,99), H = <f2, f3> (non-normal, core free), m = [G:H], n = 4m = 240. Elements are named by the polycyclic generating sequence f_1,...,f_r of SmallGroup(360,99), as in the paper's Appendix A. CSS commutation is automatic (L(g) and R(n) commute for every g in G and n in N_G(H), so each block of H_X H_Z^T is L R + R L = 0 over F_2); no search for it is needed. n, k and the check weight 6 reproduce the paper's Table I exactly. Literature baseline seeded from the published parameters: this entry is a REPRODUCTION built from the paper's printed data, not a new construction and not a new parameter set. The paper certifies d = 20 by integer program; this entry carries witness-backed upper bounds from our own randomized GF(2) search, which is a weaker claim.",
  "references": [
   "arXiv:2610.12782",
   "arXiv:2606.17268"
  ],
  "date": "2026-10-12",
  "notes": "Literature baseline (file suffix -b: another code already holds codes/240-8-20.json at the same [[240,8,20]] parameters -- the 2BGA code on Dic_30 at check weight 8, by @vprusso. This is a different code, the CLP construction at check weight 6, and it strictly dominates that entry on w). a reproduction of the published parameters in arXiv:2610.12782 (Table I), not a new construction and not a new parameter set. The group, subgroup and protographs are the paper's Appendix A data, rebuilt from GAP SmallGroup(l,i); n, k and the check weight reproduce the paper exactly. Reproduced by Space Bunny Alpha 1.0. The distance here is a witness-backed upper bound from our own randomized GF(2) search, a weaker claim than the paper's integer-program certification. See the accompanying note for the full reproduction recipe.",
  "origin": "baseline",
  "novelty": "known_parameters",
  "model": "Space Bunny Alpha 1.0"
 },
 "family": "2bga-coset"
}