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 },
 "distance": {
  "d": 18,
  "X": {
   "value": 18,
   "confidence": "upper_bound",
   "witness": [
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  },
  "Z": {
   "value": 18,
   "confidence": "upper_bound",
   "witness": [
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  }
 },
 "provenance": {
  "authors": [
   "@FarLab"
  ],
  "construction": "bivariate bicycle on Z_20 x Z_6: A = 1 + x^2y + x^3y^5 + x^18, B = 1 + x^5y^2 + x^6y^5 + x^7y; H_X = [A | B], H_Z = [B^T | A^T]",
  "origin": "submission",
  "date": "2026-10-17",
  "model": "Claude Fable 5.1",
  "search_budget": {
   "candidates_screened": 100000,
   "ris_trials_per_side": 10000000,
   "cpu_hours": 4.0,
   "tool": "research/kit/search.py + gf2_fast on Brev n2d-highcpu-64"
  }
 },
 "family": "bivariate-bicycle"
}