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expansion gas : 24 phrases in 11 subjects |
| Automobiles | 2 |
| Aviation | 2 |
| Chemistry | 1 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Mining | 3 |
| Oil / petroleum | 7 |
| Refrigeration | 1 |
| Space | 1 |
| Technology | 4 |
| Wind Energy | 1 |
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