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GitHub - Varshneyabhushan/kudoSudoku: A sudoku solver,using constraint programming
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SudokuWiki.org - Sudoku's Invariant Regions
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tables - How do I create a Shidoku grid? - TeX - LaTeX Stack Exchange
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Mark Huckvale's Su Doku Variants
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ExceLuisABN Matemática y Excel: Sudoku 2 x 2 y números, con TopWorksheets.
