Difficult sudoku #3515
| 9 | 6 | 7 | 4 | |||||
| 4 | 5 | 8 | ||||||
| 1 | 9 | |||||||
| 1 | 2 | 3 | ||||||
| 2 | 6 | 4 | 8 | |||||
| 1 | 7 | 3 | ||||||
| 9 | 4 | |||||||
| 1 | 2 | 5 | ||||||
| 7 | 9 | 8 | 1 |
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