Difficult sudoku #1257
| 6 | 7 | |||||||
| 9 | 8 | 3 | ||||||
| 3 | 1 | |||||||
| 1 | 7 | 3 | ||||||
| 3 | 8 | 4 | ||||||
| 3 | 9 | 5 | ||||||
| 8 | 9 | |||||||
| 1 | 4 | |||||||
| 4 | 5 | 6 | 2 |
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