Difficult sudoku #1547
| 4 | 5 | |||||||
| 3 | 8 | 6 | 1 | |||||
| 5 | 9 | 8 | ||||||
| 4 | ||||||||
| 7 | 4 | |||||||
| 8 | 5 | 1 | 7 | |||||
| 1 | 7 | 3 | ||||||
| 8 | 3 | 5 | ||||||
| 3 | 9 | 4 |
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