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perturbation : 172 phrases in 31 subjects |
| Agriculture | 1 |
| Astronautics | 1 |
| Automatic control | 3 |
| Climatology | 2 |
| Commerce | 2 |
| Communications | 18 |
| Computer numerical control | 6 |
| Earth sciences | 12 |
| Economy | 4 |
| Electricity generation | 1 |
| Electronics | 23 |
| Energy industry | 2 |
| Environment | 11 |
| Finances | 10 |
| Forestry | 2 |
| General | 4 |
| Health care | 4 |
| Information technology | 2 |
| International Monetary Fund | 6 |
| Labor law | 1 |
| Law | 2 |
| Life sciences | 11 |
| Magnetics | 15 |
| Mathematics | 6 |
| Measuring instruments | 2 |
| Mechanic engineering | 1 |
| Medical | 7 |
| Metallurgy | 1 |
| Natural sciences | 4 |
| Statistics | 5 |
| Transport | 3 |
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