Very difficult sudoku #3150
| 3 | 1 | 8 | ||||||
| 5 | 7 | |||||||
| 1 | 2 | 3 | ||||||
| 4 | 8 | 9 | ||||||
| 2 | 6 | 1 | 9 | |||||
| 7 | 1 | 4 | 6 | |||||
| 7 | 3 | 8 | ||||||
| 5 | 3 | 9 |
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