Apple buys Israeli startup Q.ai 6 months ago
In case there are any Ender's Game fans here, the capability to understand micro-expressions reminds me of how Ender subvocalizes to Jane. Orson Scott Card predicted yet another technological norm.
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concavebinator
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Solving a wooden puzzle using Haskell 10 months ago
Reminds me of a 2D puzzle I solved using Haskell https://github.com/concavegit/tile-placement-puzzle
IIRC it kept a list of board states, updated the list of board states by taking each one and applying possible moves, then removed congruencies or any state that did not have a valid next move.
The pattern seems similar to your approach that deals with rotations, though in 3D