Difficult sudoku #2508
| 3 | 5 | 4 | ||||||
| 3 | 6 | |||||||
| 1 | 8 | |||||||
| 7 | 4 | 9 | 6 | |||||
| 5 | 8 | |||||||
| 6 | 9 | |||||||
| 9 | 3 | 2 | ||||||
| 6 | 5 | 7 | 3 | |||||
| 8 | 4 | 6 | 7 |
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