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    In this earlier question the OP asked the following problem: Given a rectangular grid where some squares are empty ... -hard? Thanks so much! See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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    I was given a puzzle as a present. It consists of 4 cubes, arranged side by side. The faces of each cube ... (or combination of) that do this? See Question&Answers more detail:os...
asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)
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