Difficult sudoku #3531
| 8 | 3 | 5 | 9 | 6 | ||||
| 5 | 7 | 9 | ||||||
| 1 | 4 | 6 | ||||||
| 4 | 3 | |||||||
| 1 | 7 | |||||||
| 6 | 4 | |||||||
| 6 | 4 | 1 | ||||||
| 9 | 5 | 8 | ||||||
| 6 | 1 | 2 | 4 | 7 |
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