Difficult sudoku #3627
| 1 | 3 | 2 | 4 | |||||
| 4 | 8 | 5 | 3 | 6 | ||||
| 4 | ||||||||
| 7 | 5 | 6 | 9 | 3 | 1 | |||
| 6 | 1 | 5 | 8 | |||||
| 9 | 3 | |||||||
| 6 | ||||||||
| 3 | 7 | 9 | 1 | 5 |
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