Difficult sudoku #2121
| 3 | ||||||||
| 1 | 6 | 8 | 3 | 7 | ||||
| 7 | 2 | 1 | 9 | |||||
| 7 | 2 | 8 | 5 | |||||
| 1 | 9 | |||||||
| 5 | 4 | 7 | 1 | |||||
| 2 | 9 | 6 | 1 | |||||
| 5 | 4 | 9 | 7 | 8 | ||||
| 8 |
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