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Turning things inside out. (English)
Int. J. Pure Appl. Math. 79, No. 2, 259-268 (2012).
Summary: This article presents 3 puzzles which turn things inside out: the cube puzzle, turning a paper strip inside out, and hexaflexagons. Readers who wish to find the solutions for themselves are advised not to read the full explanations.
Classification: A20
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