Difficult sudoku #3052
| 8 | ||||||||
| 9 | 1 | |||||||
| 1 | 5 | 7 | 3 | |||||
| 3 | 4 | |||||||
| 9 | 1 | 8 | 5 | |||||
| 8 | 1 | 7 | 9 | |||||
| 3 | 2 | 4 | 5 | |||||
| 4 | 6 | |||||||
| 1 | 5 | 6 |
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