Difficult sudoku #73
| 8 | 6 | 4 | 7 | 9 | 1 | |||
| 4 | 3 | 2 | 5 | 6 | ||||
| 2 | 3 | |||||||
| 4 | 8 | 2 | 6 | |||||
| 8 | 7 | 4 | ||||||
| 3 | 5 | 1 | 9 | |||||
| 3 | 9 | |||||||
| 9 | 5 | 6 |
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