Very difficult sudoku #3070
| 3 | ||||||||
| 6 | 3 | 4 | 1 | 2 | ||||
| 4 | 7 | |||||||
| 6 | 5 | 2 | ||||||
| 9 | 3 | 5 | ||||||
| 8 | 1 | |||||||
| 4 | 3 | 8 | 2 | |||||
| 6 | ||||||||
| 5 | 2 | 9 |
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