Difficult sudoku #3659
| 5 | 3 | |||||||
| 6 | 3 | 2 | ||||||
| 7 | 1 | |||||||
| 7 | 3 | 4 | ||||||
| 9 | 6 | 8 | ||||||
| 5 | 4 | 2 | 7 | |||||
| 2 | 6 | 8 | 1 | 4 | ||||
| 4 | 7 | 8 | 1 | 3 |
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