Very difficult sudoku #1629
| 8 | 2 | 4 | ||||||
| 6 | ||||||||
| 1 | 4 | 2 | ||||||
| 2 | 8 | 5 | ||||||
| 1 | 2 | 9 | ||||||
| 9 | 4 | 6 | 7 | |||||
| 5 | 4 | 7 | 9 | |||||
| 8 | ||||||||
| 6 | 3 |
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