Very difficult sudoku #1839
| 8 | 3 | 1 | ||||||
| 9 | 1 | |||||||
| 1 | 4 | 2 | 3 | |||||
| 7 | 9 | 6 | ||||||
| 2 | 4 | 7 | ||||||
| 1 | 3 | 7 | ||||||
| 7 | 3 | 4 | 6 | 8 | 9 | |||
| 1 | 4 | |||||||
| 8 | 3 |
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