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 "provenance": {
  "authors": [
   "@mathysrennela"
  ],
  "construction": "2BGA on nonabelian group C4xQ16 (order 64). Weight-4 supports a=[6,24,37,60], b=[5,33,44,51] give row weight 8. Odd k=21 unreachable by abelian BB. Found by systematic 2BGA sweep over nonabelian groups of order 60-200, filtering for odd k, screened at 400 RIS trials. Top efficiency kd\u00b2/n=10.5 from 240 candidates.",
  "references": [],
  "date": "2026-07-30",
  "notes": "",
  "model": "Xiaomi Mimo-V2.5"
 },
 "family": "generalized-bicycle"
}