Very difficult sudoku #2157
| 5 | 3 | 8 | ||||||
| 1 | 2 | 6 | 4 | |||||
| 9 | ||||||||
| 1 | 3 | |||||||
| 5 | 6 | 4 | 2 | 9 | ||||
| 2 | 7 | 4 | ||||||
| 3 | 5 | 7 | ||||||
| 8 | 4 | 9 | 1 | |||||
| 5 | 4 |
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