Difficult sudoku #3339
| 8 | 5 | 4 | 2 | |||||
| 5 | 2 | 4 | 1 | |||||
| 4 | 7 | 6 | 1 | 5 | ||||
| 8 | 5 | 1 | ||||||
| 7 | 4 | |||||||
| 4 | 9 | |||||||
| 5 | 7 | 2 | 3 | |||||
| 3 | 8 |
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