Difficult sudoku #633
| 8 | 1 | 4 | ||||||
| 3 | 8 | |||||||
| 4 | 1 | 5 | 8 | |||||
| 2 | 7 | |||||||
| 8 | 9 | |||||||
| 7 | 5 | 9 | 2 | 6 | ||||
| 7 | 6 | 3 | ||||||
| 9 | 7 | |||||||
| 5 | 4 | 8 |
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