Very difficult sudoku #3264
| 7 | ||||||||
| 3 | 1 | |||||||
| 9 | 2 | |||||||
| 9 | 5 | |||||||
| 3 | 7 | |||||||
| 7 | 8 | 4 | 2 | 6 | ||||
| 8 | 9 | 6 | ||||||
| 5 | 7 | |||||||
| 1 | 6 | 4 |
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