Difficult sudoku #3354
| 6 | 7 | 4 | ||||||
| 7 | 9 | 8 | ||||||
| 5 | 1 | |||||||
| 3 | ||||||||
| 9 | 2 | 7 | 3 | |||||
| 1 | 3 | 4 | 9 | |||||
| 9 | 1 | 5 | 7 | |||||
| 6 | 2 | |||||||
| 4 | 9 | 8 |
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