Very difficult sudoku #3710
| 8 | ||||||||
| 5 | 6 | 4 | 9 | |||||
| 7 | 4 | 5 | ||||||
| 6 | 7 | 4 | 9 | 1 | ||||
| 1 | 5 | |||||||
| 2 | 4 | 9 | ||||||
| 8 | ||||||||
| 2 | 3 | |||||||
| 3 | 1 | 2 |
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