Difficult sudoku #444
| 7 | 8 | 1 | ||||||
| 9 | ||||||||
| 6 | 2 | |||||||
| 8 | 6 | 7 | ||||||
| 2 | 9 | |||||||
| 9 | 1 | 5 | 4 | 6 | ||||
| 7 | 4 | 6 | ||||||
| 2 | 1 | 7 | 3 | |||||
| 1 | 9 |
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