Difficult sudoku #1769
| 9 | ||||||||
| 7 | 5 | |||||||
| 2 | 6 | 8 | 7 | |||||
| 6 | ||||||||
| 8 | 5 | 4 | 1 | |||||
| 7 | 3 | 8 | ||||||
| 4 | 2 | |||||||
| 3 | 4 | 8 | ||||||
| 6 | 1 | 2 | 5 |
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