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core valves : 16 phrases in 10 subjects |
| Automobiles | 4 |
| Aviation | 1 |
| Chemistry | 1 |
| Compressors | 1 |
| Cycle sport | 1 |
| Cycling other than sport | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 1 |
| Refrigeration | 2 |
| Technology | 3 |
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