Difficult sudoku #2569
| 5 | 3 | |||||||
| 9 | 5 | 3 | 6 | |||||
| 7 | 3 | 6 | 5 | |||||
| 5 | 7 | 8 | 4 | |||||
| 1 | ||||||||
| 6 | 9 | 2 | 5 | |||||
| 3 | 9 | 5 | 8 | |||||
| 8 | 6 | 2 | 1 | |||||
| 6 | 7 |
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