Difficult sudoku #3690
| 9 | 2 | 6 | 8 | |||||
| 7 | 8 | 9 | ||||||
| 2 | 7 | 3 | ||||||
| 7 | 4 | 9 | 5 | |||||
| 3 | 8 | 7 | 1 | |||||
| 8 | 1 | 6 | ||||||
| 5 | 9 | 3 | ||||||
| 3 | 8 | 4 | 6 |
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