Difficult sudoku #3420
| 1 | 8 | 5 | ||||||
| 9 | 2 | 7 | ||||||
| 9 | 3 | |||||||
| 1 | ||||||||
| 2 | 3 | 4 | 9 | 8 | ||||
| 5 | 7 | 3 | ||||||
| 3 | 5 | 9 | 6 | |||||
| 8 | ||||||||
| 6 | 7 | 1 | 5 |
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