![PDF] Which is harder? - Classification of Happy Cube puzzles | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/99f86d8e5ab8a4940410bdf7488bde0c04709be0/10-Figure9-1.png "PDF] Which is harder? - Classification of Happy Cube puzzles | Semantic Scholar")
PDF] Which is harder? - Classification of Happy Cube puzzles | Semantic Scholar
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