Difficult sudoku #266
| 8 | 1 | 5 | 6 | |||||
| 2 | 9 | |||||||
| 6 | 2 | 4 | 3 | 8 | ||||
| 5 | ||||||||
| 9 | 5 | 3 | 1 | 6 | ||||
| 4 | 7 | 6 | 5 | |||||
| 6 | 1 | 9 | ||||||
| 3 | 7 | 9 | ||||||
| 7 | 6 |
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