Difficult sudoku #1740
| 2 | 5 | 7 | 8 | |||||
| 9 | 6 | 2 | ||||||
| 4 | 7 | |||||||
| 9 | 4 | 7 | 2 | 5 | ||||
| 6 | 3 | 2 | 8 | 4 | ||||
| 5 | 1 | |||||||
| 3 | 4 | 8 | ||||||
| 6 | 2 | 8 | 9 |
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