Difficult sudoku #683
| 8 | 1 | 9 | ||||||
| 5 | 2 | 6 | 8 | |||||
| 1 | 2 | |||||||
| 2 | 6 | 3 | 9 | |||||
| 4 | 8 | |||||||
| 1 | 3 | |||||||
| 8 | 1 | 7 | ||||||
| 4 | ||||||||
| 4 | 7 | 6 |
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