Difficult sudoku #3497
| 8 | 4 | |||||||
| 2 | 6 | 9 | ||||||
| 5 | 7 | 2 | 4 | |||||
| 6 | 5 | |||||||
| 4 | 2 | 3 | 7 | |||||
| 3 | ||||||||
| 1 | 6 | |||||||
| 9 | 2 | |||||||
| 3 | 4 | 7 |
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