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research engine : 16 phrases in 10 subjects |
| Automobiles | 4 |
| Aviation | 3 |
| Chemistry | 1 |
| Drilling | 1 |
| General | 2 |
| Oil / petroleum | 1 |
| Oil processing plants | 1 |
| Shipbuilding | 1 |
| Space | 1 |
| United Kingdom | 1 |
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