Very difficult sudoku #3407
| 8 | 9 | 3 | ||||||
| 1 | 4 | 2 | ||||||
| 7 | 6 | |||||||
| 9 | 2 | 7 | 8 | |||||
| 5 | 4 | 1 | ||||||
| 4 | 6 | |||||||
| 6 | ||||||||
| 1 | 9 | 8 | 3 | |||||
| 5 | 9 | 3 |
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