Difficult sudoku #1659
| 6 | ||||||||
| 5 | 9 | 7 | ||||||
| 5 | 8 | |||||||
| 4 | 2 | 1 | ||||||
| 6 | 9 | |||||||
| 8 | 3 | 7 | 5 | |||||
| 1 | 5 | |||||||
| 3 | 8 | 4 | 2 | |||||
| 7 | 2 | 3 | 4 |
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