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abatement smoke : 18 phrases in 9 subjects |
| Automobiles | 1 |
| Chemistry | 1 |
| Ecology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 1 |
| Technology | 8 |
| Textile industry | 1 |
| Wind Energy | 1 |
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