Very difficult sudoku #3423
| 7 | ||||||||
| 1 | 9 | 3 | 6 | |||||
| 1 | 6 | 5 | 8 | 4 | 9 | |||
| 6 | 2 | 5 | 9 | |||||
| 7 | 3 | 9 | 1 | |||||
| 3 | 8 | 6 | 5 | 7 | 4 | |||
| 7 | 1 | 8 | 5 | |||||
| 6 |
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