Difficult sudoku #665
| 7 | 5 | 4 | ||||||
| 3 | 2 | 7 | ||||||
| 6 | 8 | 7 | ||||||
| 9 | 3 | 6 | ||||||
| 6 | 9 | |||||||
| 9 | 4 | 1 | ||||||
| 6 | 2 | 9 | ||||||
| 4 | 3 | 2 | ||||||
| 5 | 8 | 7 |
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