{
 "schema_version": "0.2",
 "name": "[[42,12,4]]",
 "code_type": "CSS",
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 "provenance": {
  "authors": [
   "@Ronaldoengenhariadacomputacao",
   "Ronaldo Rodrigues"
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  "construction": "Multivariate bicycle code on Z_3 x Z_7: H_X=[A|B], H_Z=[B^T|A^T] over F_2[Z_3 x Z_7], with A=y^2+y^4+y^5, B=y^4+y^6+x+x^2. Independently found; parameters tie the existing board entry 42-12-4.json (SmallGroup(21,2), a different, non-abelian construction) but this one uses the abelian group Z_3 x Z_7 (isomorphic to Z_21).",
  "origin": "submission",
  "date": "2026-10-11",
  "model": "Claude Sonnet 5"
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 "family": "multivariate-bicycle"
}