Very difficult sudoku #3391
| 3 | 4 | 7 | ||||||
| 3 | ||||||||
| 7 | 5 | 2 | ||||||
| 9 | 8 | 6 | ||||||
| 2 | 1 | 9 | ||||||
| 1 | 8 | 5 | 2 | |||||
| 3 | 1 | 4 | 9 | |||||
| 1 | 4 | 3 | ||||||
| 8 | 9 | 7 |
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