Difficult sudoku #571
| 6 | ||||||||
| 2 | 1 | 3 | ||||||
| 3 | 7 | 4 | ||||||
| 4 | 9 | 7 | ||||||
| 7 | 9 | 2 | ||||||
| 8 | 2 | 3 | ||||||
| 6 | 3 | 2 | 5 | |||||
| 1 | 7 | 8 | ||||||
| 3 | 9 | 6 |
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