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perturbation : 125 phrases in 25 subjects |
| Agriculture | 1 |
| Art | 1 |
| Astronautics | 1 |
| Communications | 15 |
| Computer numerical control | 5 |
| Earth sciences | 9 |
| Economy | 6 |
| Electronics | 14 |
| Energy industry | 2 |
| Environment | 9 |
| Finances | 7 |
| General | 7 |
| Health care | 5 |
| Information technology | 1 |
| Labor law | 1 |
| Law | 5 |
| Life sciences | 11 |
| Mathematics | 5 |
| Measuring instruments | 2 |
| Mechanic engineering | 1 |
| Medical | 7 |
| Natural sciences | 3 |
| Physical sciences | 1 |
| Statistics | 2 |
| Transport | 4 |
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