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primary fuel : 19 phrases in 10 subjects |
| Automobiles | 3 |
| Aviation | 1 |
| Business | 1 |
| Chemistry | 2 |
| Economy | 1 |
| Electronics | 1 |
| General | 2 |
| Oil / petroleum | 2 |
| Oil processing plants | 1 |
| Technology | 5 |
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