Difficult sudoku #2172
| 8 | 1 | 2 | ||||||
| 4 | 1 | 3 | ||||||
| 4 | 6 | |||||||
| 5 | 2 | 9 | 6 | 1 | ||||
| 2 | 4 | 9 | 5 | |||||
| 6 | 9 | |||||||
| 3 | 4 | 7 | 9 | |||||
| 9 | 2 | 5 | 4 | 8 | ||||
| 5 | 4 |
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