Difficult sudoku #2570
| 2 | 1 | |||||||
| 7 | 5 | 8 | 4 | 1 | ||||
| 1 | 6 | 8 | ||||||
| 6 | ||||||||
| 9 | 5 | 7 | ||||||
| 4 | 3 | 5 | 7 | |||||
| 6 | 8 | 3 | 5 | |||||
| 3 | 2 | 8 | ||||||
| 4 | 8 |
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