Very difficult sudoku #3424
| 1 | 3 | |||||||
| 9 | 7 | 3 | 5 | |||||
| 6 | 5 | 2 | ||||||
| 3 | 2 | |||||||
| 1 | 4 | |||||||
| 5 | 4 | 6 | 9 | |||||
| 1 | 6 | 3 | 7 | |||||
| 8 | 7 | 2 | 3 |
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