Difficult sudoku #186
| 3 | 2 | 7 | ||||||
| 5 | 3 | 4 | ||||||
| 6 | 4 | 5 | ||||||
| 4 | ||||||||
| 2 | 9 | 4 | ||||||
| 1 | 5 | 8 | 2 | |||||
| 2 | 9 | 3 | ||||||
| 6 | 5 | 8 | ||||||
| 3 | 2 | 6 | 9 |
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