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operations center : 356 phrases in 21 subjects |
| Agriculture | 1 |
| Air defense | 23 |
| Aviation | 81 |
| Business | 2 |
| Computer networks | 1 |
| Earth sciences | 9 |
| Economy | 1 |
| Electronics | 87 |
| General | 11 |
| Geophysics | 2 |
| Information technology | 8 |
| International trade | 1 |
| Military | 1 |
| Navigation | 5 |
| Oil / petroleum | 1 |
| Securities | 3 |
| Shipbuilding | 1 |
| Space | 66 |
| Technology | 16 |
| Telecommunications | 8 |
| United States | 28 |
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