Very difficult sudoku #3646
| 2 | 6 | 9 | 4 | |||||
| 4 | 2 | 9 | ||||||
| 9 | 5 | |||||||
| 5 | 7 | 9 | ||||||
| 3 | 7 | |||||||
| 8 | 7 | 1 | 2 | |||||
| 4 | 9 | 6 | ||||||
| 8 | 6 | 3 | 4 | |||||
| 4 | 1 |
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