Very difficult sudoku #1712
| 2 | ||||||||
| 3 | 8 | 5 | 7 | 2 | ||||
| 7 | 4 | 8 | 6 | |||||
| 9 | 6 | 1 | ||||||
| 5 | 7 | |||||||
| 9 | 7 | 4 | ||||||
| 2 | 7 | 6 | 1 | |||||
| 6 | 7 | 8 | 2 | 9 | ||||
| 3 |
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