Difficult sudoku #3579
| 7 | 3 | 1 | 4 | |||||
| 9 | 2 | 1 | ||||||
| 6 | 1 | |||||||
| 8 | 7 | 3 | 6 | |||||
| 3 | 9 | 8 | 5 | 2 | ||||
| 2 | 6 | |||||||
| 6 | 9 | 3 | ||||||
| 6 | 7 | 1 | ||||||
| 7 | 1 | 6 | 5 |
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