Difficult sudoku #3243
| 9 | 6 | |||||||
| 4 | ||||||||
| 3 | 7 | |||||||
| 5 | ||||||||
| 4 | 8 | 1 | ||||||
| 2 | 6 | 5 | ||||||
| 6 | 4 | 2 | 1 | 9 | ||||
| 1 | 7 | 3 | ||||||
| 9 | 5 | 7 |
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