Very difficult sudoku #3039
| 1 | 5 | 2 | 9 | 3 | ||||
| 8 | 7 | 3 | 5 | |||||
| 5 | 2 | 6 | 4 | |||||
| 1 | 9 | |||||||
| 8 | 1 | |||||||
| 7 | 3 | 9 | 1 | 4 | 2 | |||
| 1 | 6 | 2 | 8 |
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