Very difficult sudoku #542
| 3 | 2 | 9 | ||||||
| 1 | 2 | 6 | ||||||
| 6 | 8 | |||||||
| 4 | 6 | 3 | ||||||
| 7 | 9 | 8 | ||||||
| 8 | 5 | 4 | ||||||
| 1 | 9 | 3 | ||||||
| 7 | 4 | 5 | 1 |
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