Difficult sudoku #3275
| 7 | 8 | 2 | ||||||
| 6 | 7 | |||||||
| 9 | 5 | 7 | 6 | |||||
| 2 | 9 | |||||||
| 9 | 8 | 1 | 6 | 2 | 7 | |||
| 4 | 9 | 8 | ||||||
| 9 | 5 | 4 | 8 | 6 | 3 | |||
| 3 | 9 |
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