Very difficult sudoku #2143
| 1 | 4 | 3 | 2 | |||||
| 3 | 5 | |||||||
| 9 | 2 | |||||||
| 6 | 5 | |||||||
| 7 | 4 | |||||||
| 4 | 8 | 9 | ||||||
| 6 | ||||||||
| 6 | 9 | 1 | 8 | 7 | ||||
| 5 | 9 | 1 |
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