Difficult sudoku #1689
| 5 | 3 | 7 | ||||||
| 9 | 1 | 2 | 4 | 5 | 8 | |||
| 7 | 3 | 5 | 2 | |||||
| 3 | 6 | |||||||
| 6 | 8 | 1 | 5 | |||||
| 5 | 4 | 9 | 8 | 1 | 6 | |||
| 4 | 6 | 5 |
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