Difficult sudoku #3577
| 5 | ||||||||
| 9 | 4 | 6 | 1 | |||||
| 4 | 8 | 5 | ||||||
| 2 | 4 | 8 | 1 | |||||
| 2 | 3 | 8 | ||||||
| 7 | 9 | |||||||
| 4 | 2 | |||||||
| 9 | 6 | |||||||
| 5 | 3 | 6 |
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