Difficult sudoku #1801
| 8 | 1 | 9 | 2 | |||||
| 7 | 2 | 3 | 8 | 1 | ||||
| 6 | 3 | 7 | 2 | |||||
| 3 | 6 | 9 | 8 | |||||
| 9 | 6 | |||||||
| 1 | 6 | 8 | 7 | |||||
| 7 | 1 | 4 |
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