Difficult sudoku #2908
| 6 | 1 | 7 | 8 | |||||
| 4 | 9 | 6 | 3 | |||||
| 2 | 9 | |||||||
| 5 | 7 | 1 | ||||||
| 6 | 4 | 9 | 7 | |||||
| 1 | 3 | |||||||
| 8 | 7 | 6 | 1 | 2 | 4 | |||
| 8 | 4 | |||||||
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