Difficult sudoku #2442
| 7 | 1 | 9 | 2 | |||||
| 1 | 8 | |||||||
| 3 | 4 | 5 | 9 | |||||
| 3 | ||||||||
| 1 | 8 | 4 | 5 | |||||
| 4 | ||||||||
| 7 | 6 | 1 | 8 | |||||
| 8 | 2 | |||||||
| 6 | 3 | 9 | 1 |
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