Difficult sudoku #684
| 1 | 4 | 2 | ||||||
| 8 | ||||||||
| 9 | 7 | |||||||
| 9 | 5 | |||||||
| 6 | 5 | 7 | 8 | |||||
| 1 | 9 | 7 | 4 | |||||
| 7 | 4 | 8 | 6 | |||||
| 6 | 8 | |||||||
| 1 | 5 | 2 | 6 | 4 |
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