Difficult sudoku #777
| 3 | 2 | 4 | ||||||
| 5 | 9 | 3 | 8 | 6 | ||||
| 4 | 9 | |||||||
| 2 | 6 | 7 | 5 | |||||
| 3 | 5 | |||||||
| 9 | 1 | 8 | 6 | |||||
| 5 | 8 | |||||||
| 4 | 8 | 9 | 2 | 1 | ||||
| 6 | 1 | 7 |
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