Difficult sudoku #779
| 3 | 9 | 1 | 8 | 5 | ||||
| 6 | ||||||||
| 7 | 8 | 9 | ||||||
| 8 | 4 | 1 | ||||||
| 1 | 5 | 6 | 3 | |||||
| 4 | 6 | 2 | ||||||
| 4 | 5 | 6 | ||||||
| 2 | ||||||||
| 6 | 3 | 4 | 9 | 8 |
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