Very difficult sudoku #1773
| 6 | 5 | |||||||
| 5 | 7 | |||||||
| 4 | 3 | 1 | ||||||
| 3 | 9 | 8 | ||||||
| 6 | 2 | 7 | ||||||
| 7 | 1 | |||||||
| 2 | 8 | 4 | 9 | |||||
| 9 | 1 | 5 | 8 | 6 |
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