Very difficult sudoku #3134
| 8 | 2 | 7 | 9 | |||||
| 6 | ||||||||
| 6 | 4 | |||||||
| 4 | 7 | 6 | 5 | |||||
| 7 | 8 | 2 | 1 | 4 | 6 | |||
| 1 | 2 | |||||||
| 5 | 7 | 8 | ||||||
| 6 | 8 | 1 | 4 | 3 |
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