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double chain : 45 phrases in 10 subjects |
| Agriculture | 1 |
| Automobiles | 10 |
| Business | 1 |
| Chemistry | 1 |
| Dermatology | 1 |
| Metallurgy | 4 |
| Plastics | 2 |
| Polymers | 3 |
| Technology | 11 |
| Textile industry | 11 |
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