Very difficult sudoku #2927
| 1 | 2 | 9 | ||||||
| 5 | 2 | 3 | 1 | |||||
| 8 | 3 | |||||||
| 7 | 2 | 6 | 1 | |||||
| 1 | 3 | 9 | 2 | 4 | ||||
| 7 | 1 | 6 | 5 | 3 | ||||
| 6 | 7 | |||||||
| 2 | 3 | 6 |
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