Difficult sudoku #681
| 5 | 9 | |||||||
| 3 | 7 | |||||||
| 2 | 7 | 3 | 8 | 5 | 4 | |||
| 8 | 7 | 2 | 9 | |||||
| 2 | 4 | |||||||
| 5 | 7 | 2 | 8 | |||||
| 7 | 2 | 8 | 9 | |||||
| 1 | 3 | 2 | 4 | |||||
| 8 |
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