Difficult sudoku #3657
| 6 | 7 | 3 | 1 | 8 | ||||
| 9 | 1 | 2 | 8 | 4 | 3 | |||
| 4 | 6 | |||||||
| 6 | 2 | 3 | ||||||
| 9 | 2 | 4 | 7 | 8 | ||||
| 4 | 6 | |||||||
| 3 | 7 | 1 | ||||||
| 6 | 4 | 7 | 2 |
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