Difficult sudoku #2425
| 2 | 7 | 8 | 1 | 9 | ||||
| 5 | 2 | |||||||
| 6 | 3 | 7 | ||||||
| 2 | 8 | 7 | ||||||
| 6 | 4 | |||||||
| 1 | 2 | 5 | ||||||
| 1 | 9 | 8 | ||||||
| 3 | 9 | |||||||
| 8 | 3 | 1 | 9 | 4 |
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