Difficult sudoku #668
| 7 | 9 | |||||||
| 7 | 1 | 4 | 8 | 6 | ||||
| 9 | 4 | 2 | 5 | |||||
| 6 | 9 | 3 | ||||||
| 9 | 2 | 4 | ||||||
| 3 | 6 | 9 | ||||||
| 7 | 2 | 9 | 6 | |||||
| 1 | 6 | 8 | 4 | 2 | ||||
| 1 | 7 |
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