Difficult sudoku #3468
| 5 | 9 | |||||||
| 9 | 2 | 3 | ||||||
| 8 | 7 | |||||||
| 1 | 3 | 2 | 8 | |||||
| 7 | 6 | 4 | ||||||
| 1 | 7 | |||||||
| 6 | 2 | |||||||
| 1 | 7 | 6 | ||||||
| 8 | 5 | 1 |
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