Difficult sudoku #3529
| 5 | 3 | 8 | ||||||
| 8 | 7 | 5 | 2 | 9 | ||||
| 3 | 9 | 7 | ||||||
| 1 | 4 | |||||||
| 8 | 4 | 5 | 7 | 3 | 9 | |||
| 1 | 4 | 6 | 2 | |||||
| 3 | 7 | 1 | 8 |
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