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Oval Track and Other Permutation Puzzles: And Just Enough Group Theory to Solve Them (Classroom Resource Materials): John O. Kiltinen: 9780883857250: Amazon.com: Books
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Oval Track and Other Permutation Puzzles: And Just Enough Group Theory to Solve Them (Classroom Resource Materials): John O. Kiltinen: 9780883857250: Amazon.com: Books