Difficult sudoku #1164
| 9 | 2 | 6 | ||||||
| 5 | 1 | 6 | ||||||
| 1 | ||||||||
| 5 | ||||||||
| 4 | 2 | 7 | 8 | |||||
| 3 | 7 | 6 | ||||||
| 3 | 7 | 9 | 4 | |||||
| 3 | ||||||||
| 5 |
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