Very difficult sudoku #1407
| 2 | 6 | 3 | ||||||
| 1 | ||||||||
| 1 | 6 | 8 | 2 | 9 | ||||
| 9 | 4 | |||||||
| 7 | 9 | 3 | ||||||
| 5 | 8 | 4 | 1 | |||||
| 7 | 6 | 9 | 8 | |||||
| 4 | 8 | |||||||
| 2 |
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