Difficult sudoku #1980
| 1 | 9 | 2 | 6 | |||||
| 3 | 6 | 5 | ||||||
| 2 | 4 | |||||||
| 5 | ||||||||
| 1 | 4 | 2 | 9 | |||||
| 2 | 4 | |||||||
| 3 | 9 | 7 | ||||||
| 8 | 4 | 7 | 2 | |||||
| 6 |
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