Difficult sudoku #3196
| 4 | 2 | |||||||
| 7 | 9 | 1 | 8 | |||||
| 6 | 2 | 1 | ||||||
| 1 | 3 | |||||||
| 2 | 8 | 6 | 4 | 7 | ||||
| 4 | 2 | 7 | 6 | |||||
| 1 | 3 | |||||||
| 5 | ||||||||
| 6 | 8 | 4 |
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