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The numbers 1 to 9 must appear exactly once in each diagonal running from top-left to bottom-right and from top-right to bottom-left. how to solve a sudoku puzzlevery very difficult sudoku Step 5: Look for Hidden Pairs and Quadruples Hidden pairs and quadruples are similar to naked pairs and triples but occur in a more complex manner. detroit news sudoku With the convenience of downloadable PDFs with answers, you can enjoy Sudoku puzzles anytime, anywhere.
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