Difficult sudoku #1657
| 1 | 3 | 9 | ||||||
| 2 | 6 | 5 | ||||||
| 7 | 1 | 6 | ||||||
| 3 | 5 | 9 | 8 | |||||
| 4 | 1 | 8 | 5 | 6 | ||||
| 8 | 1 | |||||||
| 7 | 5 | 4 | 6 | |||||
| 8 | 4 | 1 | ||||||
| 7 | 2 |
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