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logical deduction - Puzzle of putting numbers 1-9 in 3x3 Grid to add up to 15 - Puzzling Stack Exchange
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Jigsaw Sudoku: 72 9x9 Jigsaw Sudoku Puzzles: Puzzles, Print At Home: 9781698990552: Amazon.com: Books
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Sudoku 200 Fenster-Sudoku: Sudoku-Bücherei 15 (German Edition): Katteker, Joe: 9781503204881: Amazon.com: Books
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3 by 3 Magic Squad | 3x3 Magic Square | Two Easy methods on 3x3 Magic Square | Magic Square 3*3 - YouTube
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