Difficult sudoku #1644
| 6 | 3 | 9 | ||||||
| 9 | 5 | 6 | 7 | |||||
| 1 | 4 | 6 | ||||||
| 6 | 8 | |||||||
| 5 | 8 | 6 | 4 | |||||
| 9 | 8 | |||||||
| 2 | 3 | 8 | ||||||
| 4 | 2 | 1 | 6 | |||||
| 3 | 4 | 2 |
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