Difficult sudoku #409
| 3 | 1 | |||||||
| 7 | 2 | |||||||
| 3 | 8 | 5 | 4 | |||||
| 8 | 7 | 9 | ||||||
| 4 | 5 | |||||||
| 6 | 5 | 2 | 1 | |||||
| 4 | 7 | 2 | ||||||
| 9 | ||||||||
| 2 | 1 | 6 | 4 |
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