Difficult sudoku #2538
| 2 | 1 | 4 | 8 | 7 | ||||
| 5 | 3 | |||||||
| 2 | ||||||||
| 8 | 9 | 6 | 7 | 3 | ||||
| 7 | 9 | 8 | 1 | 4 | ||||
| 6 | ||||||||
| 9 | 8 | 7 | 2 | |||||
| 6 | 4 | |||||||
| 2 | 7 | 1 | 9 |
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