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X-Wings and the Rectangle Rule for Solving Medium to Hard Sudoku Puzzles
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Х-wing - an Advanced Sudoku technique
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Y-wing (XY Wing) - an Advanced Sudoku technique
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In which I solve an EXTREME SUDOKU for Twitter
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Sudoku Tutorial #62. How to spot an X wing using rows, and then knowing what to do!
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Sudoku X - Rules & Strategies
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Sudoku X Rules
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How To Do Hard Sudokus In 10 Minutes
