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  "construction": "Holey rotated surface code on integer grid L=13, period-3 hole sublattice: X plaquettes on even-parity cells, Z on odd-parity cells, X-holes at (3a,3b) even parity, Z-holes at (3a,3b) odd parity, margin 3 from boundaries (smallest size of the family generalizing codes/625-50-3.json); standard rotated-surface boundary pairs (X chains vertical, Z chains horizontal).",
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