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variable timing : 39 phrases in 13 subjects |
Automobiles | 16 |
Computers | 2 |
Ecology | 2 |
Economy | 1 |
Gas processing plants | 1 |
General | 2 |
Information technology | 3 |
Mathematics | 1 |
Military | 4 |
Production | 2 |
Technology | 3 |
Telecommunications | 1 |
Transport | 1 |