Difficult sudoku #1692
| 3 | 1 | |||||||
| 2 | 5 | 9 | 8 | |||||
| 2 | ||||||||
| 6 | 3 | 4 | 5 | |||||
| 9 | ||||||||
| 8 | 6 | |||||||
| 1 | 4 | 3 | 8 | 9 | ||||
| 9 | 1 | 2 | ||||||
| 7 |
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