Very difficult sudoku #3117
| 2 | 6 | 7 | ||||||
| 9 | 4 | 5 | 6 | |||||
| 8 | 2 | |||||||
| 1 | 9 | 3 | ||||||
| 4 | 5 | |||||||
| 3 | 8 | 6 | ||||||
| 1 | 8 | 2 | 9 | 7 | ||||
| 6 | 2 | 1 | 4 | |||||
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