Very difficult sudoku #3552
| 8 | ||||||||
| 5 | 9 | 8 | 6 | |||||
| 3 | 5 | 9 | ||||||
| 6 | 7 | 8 | ||||||
| 8 | 9 | 6 | ||||||
| 1 | 9 | 4 | ||||||
| 1 | 6 | 5 | ||||||
| 8 | 7 | 1 | 4 | |||||
| 4 |
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