Difficult sudoku #1756
| 9 | 3 | 5 | 7 | 4 | ||||
| 4 | 9 | 8 | 3 | 1 | ||||
| 6 | 5 | 3 | 8 | |||||
| 5 | 4 | |||||||
| 3 | 4 | 7 | 6 | |||||
| 5 | 4 | 1 | 6 | 3 | ||||
| 1 | 7 | 9 | 3 | 6 | ||||
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