Difficult sudoku #2140
| 7 | 6 | |||||||
| 2 | 8 | |||||||
| 9 | 4 | 2 | 8 | |||||
| 7 | 3 | 1 | 6 | |||||
| 2 | 8 | 1 | 9 | 5 | ||||
| 6 | 3 | |||||||
| 6 | 4 | 8 | ||||||
| 9 | 3 |
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