Difficult sudoku #2635
| 5 | 3 | 8 | ||||||
| 2 | 6 | 9 | 3 | |||||
| 5 | 7 | 3 | 6 | |||||
| 8 | 6 | 1 | ||||||
| 2 | 1 | |||||||
| 5 | 4 | 9 | ||||||
| 7 | 9 | 1 | 2 | |||||
| 8 | 1 |
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