Very difficult sudoku #3709
| 4 | 1 | |||||||
| 4 | 6 | 5 | 7 | 8 | ||||
| 3 | 7 | 8 | 6 | 5 | ||||
| 7 | 1 | 6 | 9 | |||||
| 6 | 5 | 4 | 2 | |||||
| 7 | 8 | 3 | 4 | 1 | ||||
| 9 | 3 | 4 | 8 | 7 | ||||
| 4 | 1 |
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