Very difficult sudoku #688
| 2 | 8 | 4 | ||||||
| 2 | ||||||||
| 3 | 4 | 1 | ||||||
| 8 | 6 | |||||||
| 3 | 5 | |||||||
| 1 | 7 | 5 | ||||||
| 8 | 4 | 2 | 6 | |||||
| 7 | 5 | 3 | 9 | |||||
| 1 | 6 |
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