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loop pipe : 22 phrases in 9 subjects |
| Chemistry | 1 |
| Electronics | 1 |
| Hydroelectric power stations | 2 |
| Metallurgy | 1 |
| Oil / petroleum | 5 |
| Plastics | 2 |
| Refrigeration | 1 |
| Space | 3 |
| Technology | 6 |
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