Difficult sudoku #3708
| 5 | 1 | 7 | 6 | |||||
| 7 | 9 | 2 | ||||||
| 6 | 8 | 2 | ||||||
| 2 | 6 | 3 | ||||||
| 8 | ||||||||
| 9 | 7 | 1 | ||||||
| 5 | 4 | 1 | ||||||
| 6 | 4 | 1 | ||||||
| 8 | 6 | 4 | 5 |
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