Difficult sudoku #1868
| 4 | 5 | 8 | 1 | |||||
| 3 | ||||||||
| 9 | 7 | 2 | ||||||
| 6 | 8 | 1 | 3 | |||||
| 5 | ||||||||
| 9 | 5 | |||||||
| 1 | 2 | 6 | 7 | |||||
| 7 | 8 | |||||||
| 9 |
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