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   [
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   [
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   [
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   ],
   [
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   [
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   [
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   ]
  ]
 },
 "distance": {
  "d": 20,
  "X": {
   "value": 20,
   "confidence": "upper_bound",
   "witness": [
    9,
    16,
    35,
    37,
    43,
    55,
    56,
    77,
    83,
    85,
    118,
    121,
    123,
    124,
    143,
    147,
    171,
    172,
    180,
    181
   ]
  },
  "Z": {
   "value": 20,
   "confidence": "upper_bound",
   "witness": [
    1,
    5,
    6,
    14,
    32,
    49,
    65,
    74,
    76,
    90,
    131,
    136,
    137,
    140,
    143,
    144,
    147,
    159,
    164,
    185
   ]
  }
 },
 "provenance": {
  "authors": [
   "@MathysRennela"
  ],
  "construction": "Bivariate bicycle code QC(A,B) on Z_12 x Z_8 with weight-4 generators A = xy^3 + x^8y^6 + x^8y^7 + x^10y^2, B = y^2 + xy^6 + x^4y^4 + x^6y (weight-8 checks). Found by campaign 2 of a weight-8 BB sweep at n in {192, 216, 288}, beyond the regime searched by arXiv:2609.06572.",
  "origin": "submission",
  "date": "2026-09-09",
  "model": "Omen Alpha 1.0",
  "notes": "New parameters (submitter claim). Distance: RIS upper bound d<=20 (20k trials), corroborated by BP+OSD at 200k trials/side finding nothing lighter; exact certification not run.",
  "novelty": "new_parameters"
 },
 "family": "bivariate-bicycle"
}