Very difficult sudoku #863
| 9 | 5 | 4 | ||||||
| 1 | 3 | 5 | 6 | |||||
| 5 | 4 | 3 | 8 | |||||
| 8 | 7 | 3 | ||||||
| 1 | 7 | 6 | ||||||
| 1 | 7 | 8 | 9 | |||||
| 5 | 8 | 1 | 9 | |||||
| 2 | 7 | 5 |
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