Difficult sudoku #3578
| 8 | 7 | 3 | 5 | |||||
| 6 | 7 | |||||||
| 3 | 4 | 5 | ||||||
| 2 | 5 | 7 | 1 | |||||
| 9 | 1 | |||||||
| 6 | 2 | 3 | 4 | |||||
| 3 | 6 | 7 | ||||||
| 1 | 4 | |||||||
| 7 | 3 | 8 | 6 |
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