Difficult sudoku #187
| 6 | 4 | |||||||
| 1 | 9 | 8 | ||||||
| 8 | 2 | 4 | 7 | 6 | ||||
| 7 | 9 | 6 | ||||||
| 7 | 2 | 5 | ||||||
| 4 | 2 | |||||||
| 1 | 8 | 9 | ||||||
| 8 | 6 | 5 | 7 |
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