Difficult sudoku #1673
| 1 | 7 | 3 | ||||||
| 6 | 8 | 1 | ||||||
| 3 | 5 | 6 | 2 | |||||
| 7 | 5 | 1 | 8 | |||||
| 8 | ||||||||
| 8 | 4 | 7 | 1 | |||||
| 5 | 1 | 9 | 8 | |||||
| 8 | 6 | 9 | ||||||
| 7 | 5 | 3 |
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