Very difficult sudoku #3501
| 8 | ||||||||
| 2 | 1 | |||||||
| 3 | 8 | 1 | 7 | |||||
| 8 | 3 | 5 | 1 | |||||
| 3 | 2 | 9 | 6 | |||||
| 6 | 7 | |||||||
| 1 | 7 | 4 | 3 | |||||
| 5 | 7 | 9 | ||||||
| 4 |
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