Difficult sudoku #1755
| 7 | 3 | 9 | ||||||
| 3 | 9 | 8 | 7 | |||||
| 2 | 5 | 6 | ||||||
| 2 | 3 | 5 | 7 | |||||
| 9 | ||||||||
| 8 | 6 | 4 | 2 | |||||
| 8 | 1 | 2 | ||||||
| 7 | 3 | 6 | 4 | |||||
| 4 | 3 | 7 |
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