Difficult sudoku #1881
| 8 | 5 | 1 | 4 | |||||
| 1 | 9 | 2 | ||||||
| 1 | 6 | |||||||
| 5 | 1 | 2 | 9 | 7 | ||||
| 6 | 4 | 2 | ||||||
| 9 | ||||||||
| 5 | 6 | 7 | 9 | |||||
| 7 | ||||||||
| 8 | 3 | 2 |
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