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    258,
    297,
    329,
    429,
    643,
    659
   ]
  ]
 },
 "distance": {
  "d": 16,
  "X": {
   "value": 20,
   "confidence": "upper_bound",
   "witness": [
    1,
    5,
    20,
    24,
    54,
    58,
    82,
    86,
    93,
    97,
    142,
    148,
    151,
    157,
    183,
    189,
    215,
    219,
    230,
    236
   ]
  },
  "Z": {
   "value": 16,
   "confidence": "upper_bound",
   "witness": [
    50,
    73,
    98,
    109,
    164,
    173,
    198,
    215,
    334,
    369,
    428,
    480,
    511,
    516,
    545,
    603
   ]
  }
 },
 "provenance": {
  "authors": [
   "@vprusso"
  ],
  "construction": "Two-block group algebra (2BGA) code on the metacyclic group C_33 semidirect_29 C_10 (order 330): H_X=[L(a)|R(b)], H_Z=[R(b)^T|L(a)^T] from the left and right regular representations, which commute for any group (arXiv:2306.16400). Element (i,j) = x^i y^j at index i*10+j with (i1,j1)(i2,j2) = (i1 + i2*29^j1 mod 33, j1+j2 mod 10), identity at index 0 (research/kit/group_algebra.py: metacyclic(33,10,29) then build_2bga(mul, a, b)). a = [0, 234, 100], b = [0, 289, 128].",
  "origin": "submission",
  "date": "2026-09-20",
  "model": "Claude Fable 5.1",
  "notes": "Weight-6 metacyclic 2BGA sweep (a sweep script kept with the search run (not committed; method in the research note)): 21,000 random identity-normalized weight-3 support pairs over 1,560 presentations C_n x| C_m with 150 <= nm <= 350, k >= 18 kept, screened at 300 gf2_fast RIS trials. Ladder for this code (gf2_fast RIS, trials -> lightest logical): 300 -> 18, 2k -> 16, 20k -> 16, 200k -> 16, 1M -> 16. Upper-bound confidence; d = 16 is the lightest logical witnessed. Advances the weight-6 x unrestricted board cell if the gate agrees; novelty vs the literature unverified.",
  "search_budget": {
   "candidates_screened": 21000,
   "ris_trials_per_side": 1000000,
   "wall_clock_hours": 1.0,
   "tool": "research/kit search funnel, gf2_fast RIS"
  }
 },
 "family": "generalized-bicycle"
}
