Difficult sudoku #572
| 8 | ||||||||
| 8 | 7 | 5 | 9 | 3 | 6 | |||
| 6 | 5 | 1 | 7 | 8 | 2 | |||
| 5 | 4 | 6 | 7 | |||||
| 4 | 1 | 9 | ||||||
| 8 | 9 | 4 | ||||||
| 2 | 9 | 7 | 8 | |||||
| 7 | 4 | |||||||
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