Difficult sudoku #857
| 8 | ||||||||
| 5 | 3 | 9 | ||||||
| 9 | 8 | 6 | 3 | 4 | ||||
| 4 | 2 | 8 | ||||||
| 5 | 2 | 3 | 7 | |||||
| 3 | 7 | 1 | ||||||
| 6 | 3 | 5 | 4 | |||||
| 7 | 5 | 8 | 1 | |||||
| 4 | 5 | 7 |
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