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X-Wings and the Rectangle Rule for Solving Medium to Hard Sudoku Puzzles
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In which I solve an EXTREME SUDOKU for Twitter
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This AMAZING Trick Can Solve Extreme Sudoku
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Sudoku X - Rules & Strategies
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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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Solve Sudoku using X-Wing | Y-Wing | XY-Wing method | Sudoku Advanced method | imw
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What Should You Do When Your X-Wing Has a Fin?
