Difficult sudoku #3212
| 7 | 1 | 4 | 9 | |||||
| 6 | 1 | |||||||
| 4 | 1 | 9 | 8 | |||||
| 2 | 4 | 3 | ||||||
| 3 | 4 | 5 | ||||||
| 5 | 6 | 7 | ||||||
| 2 | 5 | 3 | 1 | |||||
| 3 | 8 | |||||||
| 9 | 8 | 2 | 3 |
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