Very difficult sudoku #910
| 1 | ||||||||
| 5 | 2 | 9 | ||||||
| 9 | 6 | 1 | 5 | 7 | ||||
| 8 | 5 | 9 | 6 | |||||
| 7 | 6 | 4 | ||||||
| 5 | 2 | 8 | 3 | |||||
| 2 | 1 | 9 | 7 | 5 | ||||
| 8 | 3 | 4 | ||||||
| 2 |
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