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  "construction": "Priced construction calculus E-PEEL of codes/71-12-5.json ([[71,12,5]], max check weight 6; itself Mathys Rennela's priced-calculus E-PEEL of codes/72-12-6.json, the [[72,12,6]] bivariate bicycle code of arXiv:2308.07915): delete qubit 29 (0-based index in the parent file) together with its unique X check a12, and relabel the surviving qubits in increasing order of their parent indices. Consumer: github.com/unitaryfoundation/code-calculus @ 1b9a942, machine/priced_calculus.py.",
  "references": [
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  "date": "2026-11-04",
  "notes": "Single-step priced-calculus E-PEEL child of board entry 71-12-5. verify/validate_candidate.py found no board entry sharing this code's fingerprint or Weisfeiler-Leman signature, local-Hadamard images included.",
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