Difficult sudoku #2507
| 7 | 8 | |||||||
| 9 | 5 | 1 | ||||||
| 5 | 8 | |||||||
| 1 | 2 | 7 | ||||||
| 5 | 8 | 4 | ||||||
| 6 | 3 | 1 | ||||||
| 3 | 5 | |||||||
| 9 | 1 | 6 | ||||||
| 7 | 6 | 2 |
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