Difficult sudoku #2171
| 6 | ||||||||
| 1 | 8 | |||||||
| 3 | 2 | 6 | 9 | |||||
| 7 | 5 | 2 | ||||||
| 3 | ||||||||
| 4 | 8 | 5 | 7 | |||||
| 1 | 8 | 6 | ||||||
| 6 | 2 | 3 | 5 | |||||
| 4 | 7 |
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