Difficult sudoku #505
| 5 | 8 | 7 | 9 | 4 | ||||
| 1 | 5 | |||||||
| 6 | 9 | 5 | ||||||
| 6 | 8 | 3 | ||||||
| 3 | 8 | 7 | ||||||
| 5 | 4 | 9 | ||||||
| 9 | 6 | 2 | ||||||
| 6 | 7 | |||||||
| 2 | 7 | 8 | 5 | 6 |
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