Difficult sudoku #3337
| 8 | 7 | 5 | 6 | |||||
| 6 | 1 | 4 | 3 | |||||
| 4 | 7 | |||||||
| 9 | 8 | 1 | ||||||
| 3 | ||||||||
| 6 | 3 | 8 | ||||||
| 3 | 8 | |||||||
| 1 | 2 | 5 | 9 | |||||
| 5 | 3 | 6 | 2 |
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