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filter frame : 22 phrases in 10 subjects |
| Aviation | 1 |
| Chemistry | 1 |
| Ecology | 3 |
| Metallurgy | 4 |
| Oil / petroleum | 1 |
| Plastics | 1 |
| Shipbuilding | 1 |
| Space | 1 |
| Technology | 8 |
| Water resources | 1 |
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