Difficult sudoku #1931
| 6 | 4 | 9 | ||||||
| 1 | 5 | |||||||
| 7 | 4 | 2 | 6 | |||||
| 8 | 3 | 1 | 5 | |||||
| 4 | 7 | 8 | 3 | |||||
| 7 | 8 | |||||||
| 3 | 2 | 1 | ||||||
| 6 | 4 | 1 |
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