Very difficult sudoku #528
| 1 | 8 | 3 | ||||||
| 6 | 7 | |||||||
| 5 | 8 | 1 | ||||||
| 5 | 8 | 9 | ||||||
| 2 | 5 | |||||||
| 7 | 1 | 9 | 4 | 3 | ||||
| 2 | 1 | |||||||
| 4 | 3 | 5 | ||||||
| 1 | 4 |
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