Difficult sudoku #556
| 4 | 2 | |||||||
| 5 | ||||||||
| 4 | 2 | 6 | 1 | 7 | ||||
| 9 | 3 | 1 | ||||||
| 7 | 1 | |||||||
| 7 | 6 | 9 | 4 | |||||
| 5 | 6 | |||||||
| 6 | 2 | 8 | ||||||
| 2 | 8 |
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