Difficult sudoku #1820
| 7 | 5 | 8 | 3 | |||||
| 2 | 8 | 5 | 9 | |||||
| 2 | 7 | |||||||
| 9 | 3 | 5 | ||||||
| 6 | 5 | 8 | 2 | |||||
| 3 | 9 | 4 | 1 | |||||
| 9 | 3 | |||||||
| 6 | 1 | 3 | 8 |
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