Very difficult sudoku #2733
| 7 | 3 | |||||||
| 5 | 8 | |||||||
| 1 | 8 | 7 | 3 | 4 | 5 | |||
| 7 | ||||||||
| 7 | 5 | 1 | 8 | 2 | ||||
| 3 | 2 | 6 | 1 | |||||
| 1 | 3 | |||||||
| 3 | 5 | 6 | 9 | 1 |
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