Difficult sudoku #3404
| 9 | 2 | 5 | 6 | |||||
| 1 | 3 | |||||||
| 5 | 3 | 6 | 7 | |||||
| 8 | 9 | |||||||
| 6 | 8 | |||||||
| 2 | 4 | |||||||
| 7 | 2 | 1 | 3 | |||||
| 1 | 4 | |||||||
| 4 | 9 | 7 | 2 |
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