Very difficult sudoku #1791
| 4 | 8 | 9 | ||||||
| 5 | 2 | |||||||
| 1 | 4 | 8 | 9 | |||||
| 6 | 2 | 5 | 1 | 9 | ||||
| 5 | 9 | 7 | 6 | |||||
| 7 | 3 | |||||||
| 4 | 6 | 3 | ||||||
| 3 | 1 | 2 |
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