Very Difficult Sudoku X Puzzle : r/sudoku
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Х-wing - Sudoku technique
Sudoku X: 200 Medium Sudoku X Puzzles Volume 5: Demarco, Christian: 9781728990101: Amazon.com: Books
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Jigsaw Sudoku X: 200 Medium Jigsaw Sudoku X Puzzles Volume 1: Demarco, Christian: 9781983769689: Amazon.com: Books
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Х-wing - Sudoku technique
