Difficult sudoku #3467
| 2 | 6 | 1 | 5 | 7 | ||||
| 1 | 7 | 2 | 4 | |||||
| 5 | 4 | 1 | 2 | |||||
| 8 | ||||||||
| 4 | 9 | 7 | 3 | |||||
| 6 | 5 | 3 | 2 | |||||
| 9 | 2 | 3 | 7 | 6 |
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