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stepless speed : 19 phrases in 9 subjects |
| Agriculture | 1 |
| Automobiles | 2 |
| Chemistry | 1 |
| Drilling | 1 |
| Metallurgy | 2 |
| Nuclear and fusion power | 1 |
| Oil / petroleum | 2 |
| Technology | 8 |
| Wind Energy | 1 |
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