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Logic Sudoku Game for Children and Adults. Big Size Puzzle with 8 Squares, Difficult Level. Printable Page for Brain Teaser Book. Stock Vector - Illustration of book, kids: 174156811
![Notre Dame researcher helps make Sudoku puzzles less puzzling | News | Notre Dame News | University of Notre Dame Notre Dame researcher helps make Sudoku puzzles less puzzling | News | Notre Dame News | University of Notre Dame](https://news.nd.edu/assets/80986/sudoku300.jpg)
Notre Dame researcher helps make Sudoku puzzles less puzzling | News | Notre Dame News | University of Notre Dame
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