Very difficult sudoku #3629
| 4 | 8 | |||||||
| 7 | 5 | 2 | ||||||
| 4 | ||||||||
| 4 | 1 | |||||||
| 3 | 8 | 6 | ||||||
| 7 | 2 | 9 | 8 | 4 | ||||
| 3 | 1 | |||||||
| 6 | 7 | 5 | ||||||
| 8 | 6 |
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