Difficult sudoku #3483
| 6 | ||||||||
| 2 | 3 | 4 | 8 | |||||
| 4 | 3 | 7 | 1 | |||||
| 1 | 5 | |||||||
| 7 | 3 | 9 | ||||||
| 9 | 6 | 7 | ||||||
| 3 | 1 | 9 | ||||||
| 6 | 2 | |||||||
| 2 | 8 | 6 |
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