Difficult sudoku #1707
| 5 | 3 | |||||||
| 2 | 8 | 7 | 1 | |||||
| 3 | 7 | 4 | 5 | |||||
| 5 | 6 | 2 | 4 | |||||
| 3 | 4 | |||||||
| 8 | 1 | 7 | ||||||
| 5 | 7 | 3 | 1 | 2 | ||||
| 8 | 7 | |||||||
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