Difficult sudoku #3546
| 1 | 8 | 9 | 5 | 6 | ||||
| 9 | 7 | 1 | 4 | 8 | 3 | |||
| 3 | 9 | |||||||
| 5 | 2 | 3 | 1 | |||||
| 9 | 4 | 3 | 8 | |||||
| 1 | 4 | |||||||
| 3 | 4 | |||||||
| 9 | 8 | 1 | ||||||
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