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Daily Killer Sudoku Puzzle Calendar 2017 (Daily Puzzle Calendar 2017): Snels, Nick: 9781539068860: Amazon.com: Books
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400 classic Killer sudoku 9 x 9 HARD - VERY HARD + BONUS 250 Hidoku puzzles: Sudoku with Hard, Very hard levels puzzles and a Hidoku 9 x 9 very hard levels (
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