Difficult sudoku #3116
| 1 | 8 | 5 | 7 | |||||
| 6 | ||||||||
| 5 | 1 | 6 | 9 | |||||
| 4 | 2 | 1 | ||||||
| 2 | 7 | |||||||
| 3 | 8 | 1 | ||||||
| 8 | ||||||||
| 7 | 3 | 4 | ||||||
| 5 | 3 | 7 | 1 |
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