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| toxical substance: 47 phrases in 14 subjects |
| Aviation | 1 |
| Ecology | 10 |
| Environment | 3 |
| General | 2 |
| Makarov | 5 |
| Medical | 8 |
| Natural resourses and wildlife conservation | 1 |
| Oil / petroleum | 1 |
| Oil and gas | 2 |
| Sakhalin | 1 |
| Security systems | 1 |
| Technology | 3 |
| Toxicology | 3 |
| Weapons of mass destruction | 6 |
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