Difficult sudoku #2505
| 3 | 6 | 5 | 9 | |||||
| 8 | 1 | |||||||
| 3 | 7 | 2 | 5 | |||||
| 2 | 7 | 1 | ||||||
| 4 | 3 | 5 | ||||||
| 8 | 5 | 6 | ||||||
| 8 | 9 | 6 | 1 | |||||
| 3 | 9 | |||||||
| 9 | 2 | 4 | 7 |
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