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 "provenance": {
  "authors": [
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  "construction": "Bivariate bicycle code on Z_18 x Z_6: A = y^2 + x^8 + x^13, B = y + x^7 + x^11. Found by a random screen of weight-6 BB polynomials against the bilayer board frontier. Bilayer layout (max check diameter 7.000) found by simulated annealing from a folded-torus start.",
  "origin": "submission",
  "date": "2026-09-30",
  "model": "Claude Opus 5.5"
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