Difficult sudoku #1099
| 1 | 6 | |||||||
| 1 | 2 | 8 | 7 | |||||
| 7 | 6 | 8 | 2 | |||||
| 3 | 1 | 8 | 5 | 7 | ||||
| 9 | 1 | |||||||
| 8 | 4 | 7 | 6 | |||||
| 2 | 3 | |||||||
| 6 | 9 | 5 | 8 |
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