Difficult sudoku #170
| 5 | 6 | |||||||
| 3 | 2 | 8 | ||||||
| 2 | 9 | 1 | 4 | |||||
| 5 | 4 | |||||||
| 4 | 8 | 1 | 5 | |||||
| 3 | 2 | |||||||
| 9 | 3 | 4 | 1 | |||||
| 5 | 8 | 2 | ||||||
| 4 | 1 |
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