Very difficult sudoku #991
| 4 | 1 | 7 | 6 | |||||
| 9 | 4 | 3 | ||||||
| 6 | 5 | |||||||
| 8 | 4 | 6 | 5 | 3 | 2 | |||
| 1 | 9 | 8 | 3 | 5 | 7 | |||
| 8 | 1 | 7 | 2 | 6 | 5 | |||
| 5 | 3 | 1 | 2 |
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