Sudoku X-Wing technique: when and how to use
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Sudoku X Wings - What They Are & How They Help Solve Sudokus - Mastering Sudoku
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Sudoku X-Wing technique: when and how to use
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SudokuWiki.org - X-Wing Strategy
HoDoKu: Solving Techniques - Basic Fish (X-Wing, Swordfish, Jellyfish)
