Difficult sudoku #3643
| 8 | 4 | 6 | 5 | |||||
| 4 | 1 | 8 | 9 | |||||
| 1 | 6 | 4 | ||||||
| 7 | 4 | 9 | 2 | |||||
| 6 | 2 | 4 | 5 | |||||
| 3 | 7 | 2 | 6 | |||||
| 2 | 7 | 8 | 3 | 1 | ||||
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