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Sudoku: How to Solve Puzzles: A Complete Text, Including Exercises, Answers, and Step-by-Step Procedures for an Easy and Extremely Difficult Puzzle (Daniel Simms): Simms, Daniel: 9781484836002: Amazon.com: Books
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How to Solve Sudoku: A Step-by-Step Guide: Wilson, Robin: 9781904902621: Amazon.com: Books