Difficult sudoku #649
| 5 | ||||||||
| 6 | 8 | 4 | 7 | |||||
| 3 | 7 | |||||||
| 3 | ||||||||
| 2 | ||||||||
| 1 | 5 | 2 | 9 | 8 | ||||
| 9 | ||||||||
| 5 | 1 | 7 | ||||||
| 4 | 9 | 5 |
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