Difficult sudoku #2156
| 6 | 4 | |||||||
| 9 | ||||||||
| 5 | 9 | 1 | ||||||
| 6 | 1 | 7 | ||||||
| 8 | 6 | 4 | ||||||
| 1 | 9 | 5 | 6 | |||||
| 7 | 3 | 1 | ||||||
| 2 | 7 | |||||||
| 2 | 3 | 5 | 8 |
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