Difficult sudoku #1883
| 1 | 8 | 9 | 2 | |||||
| 4 | 5 | 6 | ||||||
| 6 | 1 | 4 | 8 | 7 | ||||
| 1 | 6 | 9 | 8 | |||||
| 3 | 7 | |||||||
| 9 | ||||||||
| 1 | ||||||||
| 4 | 7 | 9 | 8 | |||||
| 2 | 5 |
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