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perforeren : 23 phrases in 10 subjects |
| Agriculture | 3 |
| Chemistry | 2 |
| Coal | 1 |
| General | 1 |
| Health care | 2 |
| Industry | 7 |
| Information technology | 1 |
| Materials science | 1 |
| Metallurgy | 4 |
| Municipal planning | 1 |
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