Difficult sudoku #2522
| 6 | 5 | |||||||
| 2 | 1 | 7 | ||||||
| 7 | 4 | 2 | ||||||
| 3 | 6 | 9 | ||||||
| 4 | 9 | |||||||
| 4 | 5 | 1 | ||||||
| 5 | 9 | 3 | ||||||
| 2 | 8 | |||||||
| 1 | 7 |
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