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pipe down : 58 phrases in 11 subjects |
| Chemistry | 1 |
| Drilling | 11 |
| Ecology | 2 |
| Hydroelectric power stations | 1 |
| Metallurgy | 6 |
| Nautical | 1 |
| Oil / petroleum | 7 |
| Plastics | 5 |
| Refrigeration | 1 |
| Shipbuilding | 1 |
| Technology | 22 |
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