Difficult sudoku #1531
| 9 | 7 | 2 | 4 | |||||
| 1 | 4 | 5 | ||||||
| 6 | 2 | |||||||
| 8 | 5 | 9 | ||||||
| 9 | 1 | |||||||
| 8 | ||||||||
| 5 | 8 | |||||||
| 7 | 4 | 3 | ||||||
| 6 | 9 | 5 | 2 |
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