Difficult sudoku #3194
| 6 | 4 | 2 | ||||||
| 9 | 6 | 4 | ||||||
| 5 | 3 | |||||||
| 2 | 1 | |||||||
| 5 | 4 | 8 | ||||||
| 2 | 3 | 1 | ||||||
| 9 | 7 | 5 | 3 | |||||
| 1 | 5 | 3 | 7 | 6 | ||||
| 6 | 1 | 2 |
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