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Amazon | Futoshiki Puzzle Book For Adults: 150+ Puzzles Vol 22 - Inequality Puzzles For Adults, Seniors and Elderly With a Mix of Additional Teasers Such as Marupeke, Sikaku, Tents and Fill-In
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Amazon | Futoshiki Puzzle Book for Adults: 252 Japanese Math Logic Puzzles | Easy to Hard | Rankin, E. "Brainbox" | Puzzles
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