Very difficult sudoku #1743
| 9 | 2 | |||||||
| 2 | 8 | 5 | 4 | |||||
| 1 | 6 | 5 | ||||||
| 5 | 7 | |||||||
| 1 | 3 | |||||||
| 8 | 9 | |||||||
| 6 | 5 | 9 | 7 | |||||
| 7 | 3 | 4 | ||||||
| 7 | 1 |
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