Difficult sudoku #2587
| 8 | 6 | 7 | 1 | |||||
| 4 | 7 | 2 | 6 | 9 | 3 | |||
| 8 | 5 | 2 | 6 | |||||
| 2 | 5 | 4 | 1 | 7 | ||||
| 4 | 6 | 7 | 3 | |||||
| 8 | 7 | |||||||
| 5 | 6 | |||||||
| 4 | 9 | 3 |
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