Difficult sudoku #1913
| 5 | 2 | 7 | 4 | |||||
| 4 | 1 | 6 | 2 | |||||
| 7 | 9 | 2 | 5 | |||||
| 3 | ||||||||
| 4 | 2 | 9 | 5 | 1 | ||||
| 9 | 8 | 4 | 6 | |||||
| 3 | 5 | 8 | ||||||
| 2 | 4 | 6 | ||||||
| 4 |
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