Very difficult sudoku #175
| 5 | 7 | |||||||
| 7 | 5 | 9 | 3 | |||||
| 8 | 1 | |||||||
| 9 | 1 | 6 | ||||||
| 1 | 5 | 3 | 2 | |||||
| 9 | 4 | 5 | ||||||
| 2 | 6 | |||||||
| 8 | 6 | 4 | 7 | |||||
| 4 | 1 |
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