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Binary Puzzles - 200 Easy to Expert 9x9 vol. 1

Binary Puzzles - 200 Easy to Expert 9x9 vol. 1 in Bloomington, MN
Current price: $6.99
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Size: OS
Each cell should contain a zero or a one. No more than two similar numbers below or next to each other are allowed. Each row and each column is unique and contains as many zeros as ones.