| Rubik's Cube |

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| References |
D. Rae Carpenter, Jr., "Rubik's Cube Puzzle", TPT, Vol. 20, # 5, May 1982, p. 317.
Jearl Walker, "Now There Is a Rubik's Magic, a New Puzzle That Provides a Study in Permutation Operators," The Amateur Scientist, (October, 1987).
"Rubik's Cube," The New Illustrated Science and Invention Encyclopedia, p. 2281. |
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