Difficult sudoku #873
| 4 | ||||||||
| 5 | ||||||||
| 3 | 6 | 7 | ||||||
| 9 | 3 | |||||||
| 9 | 2 | 1 | ||||||
| 1 | 4 | |||||||
| 2 | 1 | 8 | ||||||
| 5 | 8 | 7 | ||||||
| 1 | 5 | 2 | 4 |
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