Difficult sudoku #1865
| 9 | 5 | |||||||
| 2 | 7 | |||||||
| 5 | 4 | 8 | 1 | |||||
| 6 | 8 | 7 | 1 | 4 | 5 | |||
| 3 | 9 | |||||||
| 4 | 5 | 1 | 7 | |||||
| 8 | 1 | |||||||
| 7 | 8 | 4 | 3 |
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