Difficult sudoku #3689
| 4 | ||||||||
| 3 | 5 | 1 | 2 | 7 | ||||
| 4 | 2 | 3 | 5 | |||||
| 2 | 6 | 8 | 4 | |||||
| 5 | 3 | |||||||
| 8 | 1 | 5 | ||||||
| 9 | ||||||||
| 6 | 3 | 8 | ||||||
| 5 | 1 |
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