Difficult sudoku #3178
| 2 | ||||||||
| 5 | 4 | |||||||
| 6 | 1 | 7 | ||||||
| 5 | 9 | 7 | ||||||
| 4 | 9 | 3 | 6 | |||||
| 8 | ||||||||
| 5 | 1 | |||||||
| 8 | 7 | 6 | ||||||
| 3 | 7 | 2 | 4 |
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