Difficult sudoku #506
| 9 | 2 | 6 | 3 | |||||
| 5 | ||||||||
| 6 | 7 | 4 | ||||||
| 8 | 4 | 9 | ||||||
| 2 | 5 | 7 | 4 | |||||
| 9 | 7 | 6 | ||||||
| 8 | 4 | 5 | ||||||
| 2 | ||||||||
| 3 | 6 | 4 | 9 |
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