Difficult sudoku #1850
| 5 | 3 | 6 | ||||||
| 2 | 9 | |||||||
| 7 | 8 | 9 | 1 | |||||
| 8 | 1 | 4 | 3 | |||||
| 6 | 8 | |||||||
| 1 | 7 | 5 | ||||||
| 9 | 4 | 3 | ||||||
| 6 | 7 | |||||||
| 5 |
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