Difficult sudoku #3706
| 8 | 2 | 1 | 4 | |||||
| 1 | 2 | 6 | ||||||
| 3 | ||||||||
| 3 | 1 | |||||||
| 2 | 7 | 9 | 8 | |||||
| 3 | ||||||||
| 5 | 4 | 9 | ||||||
| 6 | 2 | 8 | 9 | |||||
| 9 | 8 |
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