Difficult sudoku #713
| 1 | 5 | 3 | 8 | |||||
| 7 | 6 | |||||||
| 3 | 7 | 5 | 9 | |||||
| 4 | 2 | 7 | ||||||
| 7 | 4 | |||||||
| 5 | 9 | 8 | ||||||
| 5 | 2 | 7 | 3 | |||||
| 9 | 4 | |||||||
| 4 | 3 | 2 | 5 |
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