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| decay: 141 phrases in 31 subjects |
| Agriculture | 4 |
| Antennas and waveguides | 5 |
| Biology | 2 |
| Chemistry | 10 |
| Communications | 5 |
| Construction | 1 |
| Earth sciences | 15 |
| Electronics | 21 |
| Energy industry | 3 |
| Entomology | 3 |
| Environment | 7 |
| Forestry | 3 |
| General | 4 |
| Health care | 7 |
| Information technology | 2 |
| Lasers | 1 |
| Life sciences | 4 |
| Mechanic engineering | 4 |
| Medical | 1 |
| Metallurgy | 1 |
| Meteorology | 2 |
| Natural resourses and wildlife conservation | 1 |
| Natural sciences | 2 |
| Nuclear and fusion power | 1 |
| Nuclear physics | 1 |
| Pest control | 1 |
| Physical sciences | 20 |
| Radiology | 1 |
| Technology | 4 |
| Transport | 2 |
| United Nations | 3 |
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