Difficult sudoku #1724
| 7 | 6 | 4 | ||||||
| 2 | 9 | 3 | 8 | 6 | ||||
| 5 | 4 | 7 | 2 | |||||
| 8 | 1 | 4 | ||||||
| 7 | 4 | 5 | 3 | |||||
| 5 | 1 | 8 | ||||||
| 8 | 4 | |||||||
| 5 | 9 | 7 | ||||||
| 3 | 6 |
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