Difficult sudoku #2186
| 6 | 8 | 9 | ||||||
| 4 | 3 | |||||||
| 7 | 1 | 5 | ||||||
| 1 | 6 | 3 | 2 | 9 | ||||
| 1 | ||||||||
| 4 | 9 | 6 | ||||||
| 7 | ||||||||
| 9 | 3 | 4 | 8 | |||||
| 2 | 5 |
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