Difficult sudoku #1242
| 5 | 2 | 7 | ||||||
| 7 | 2 | 9 | ||||||
| 2 | 8 | 4 | 7 | 1 | 3 | |||
| 2 | 1 | 6 | ||||||
| 3 | 5 | |||||||
| 1 | 8 | 4 | ||||||
| 7 | 9 | 3 | ||||||
| 4 | 1 | 3 | 7 | |||||
| 3 | 8 | 7 |
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