Difficult sudoku #3435
| 6 | 9 | |||||||
| 4 | ||||||||
| 7 | 1 | 3 | 6 | |||||
| 4 | 9 | 5 | ||||||
| 9 | 6 | 8 | ||||||
| 7 | 6 | 2 | 3 | |||||
| 3 | 2 | 1 | ||||||
| 5 | 6 | 4 | ||||||
| 5 | 7 |
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