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| triad | |||
| 三元体: 23 phrases in 11 subjects |
| Chemistry | 1 |
| Construction | 1 |
| General | 1 |
| Metallurgy | 3 |
| Plastics | 4 |
| Polymers | 2 |
| Radio | 1 |
| Securities | 1 |
| Space | 1 |
| Steel production | 1 |
| Technology | 7 |
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