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Control Bus : 64 phrases in 10 subjects |
| Air defense | 1 |
| Automobiles | 4 |
| Aviation | 19 |
| Computer networks | 1 |
| Electronics | 19 |
| Information technology | 2 |
| Project management | 1 |
| Space | 8 |
| Technology | 7 |
| Telecommunications | 2 |
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