Very difficult sudoku #784
| 2 | 1 | 5 | 9 | |||||
| 8 | 5 | 7 | 4 | |||||
| 9 | 8 | |||||||
| 4 | 7 | 1 | ||||||
| 6 | 4 | 1 | 3 | |||||
| 1 | 3 | 7 | 8 | |||||
| 1 | ||||||||
| 2 | 5 | 6 | ||||||
| 9 | 8 | 1 |
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