Very difficult sudoku #576
| 9 | 5 | 4 | 7 | |||||
| 3 | 9 | 4 | ||||||
| 5 | ||||||||
| 5 | 7 | 9 | 2 | |||||
| 6 | 7 | 1 | 9 | 8 | ||||
| 8 | 2 | 3 | 5 | |||||
| 8 | 7 | |||||||
| 1 |
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