Very difficult sudoku #3069
| 8 | 4 | 9 | 1 | 2 | ||||
| 3 | 8 | |||||||
| 6 | 3 | 4 | ||||||
| 5 | 7 | 3 | 4 | |||||
| 6 | ||||||||
| 6 | 5 | 7 | ||||||
| 1 | 8 | 9 | 3 | |||||
| 6 | 3 | 1 | 7 | 9 | ||||
| 9 | 1 |
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