Very difficult sudoku #3342
| 8 | 4 | 2 | 9 | |||||
| 1 | 9 | |||||||
| 3 | 1 | 7 | ||||||
| 5 | 7 | 2 | ||||||
| 4 | ||||||||
| 4 | 7 | 1 | 9 | 6 | 8 | |||
| 6 | 5 | 7 | ||||||
| 5 | 6 | |||||||
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