Difficult sudoku #1818
| 1 | 4 | 6 | 3 | |||||
| 6 | ||||||||
| 8 | 6 | 3 | 5 | 1 | ||||
| 5 | 4 | 9 | ||||||
| 8 | ||||||||
| 7 | 2 | 3 | ||||||
| 6 | 8 | 5 | 1 | 7 | ||||
| 2 | ||||||||
| 9 | 5 | 1 | 6 |
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