Medium sudoku #663
| 8 | 3 | 7 | ||||||
| 9 | 8 | |||||||
| 5 | 4 | 7 | 2 | 8 | ||||
| 6 | ||||||||
| 3 | 7 | 6 | 9 | 4 | ||||
| 1 | 2 | |||||||
| 4 | 1 | 9 | ||||||
| 1 | 4 | |||||||
| 5 | 7 | 6 |
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