 |
| control boundary: 58 phrases in 14 subjects |
| Aerodynamics | 1 |
| Aerohydrodynamics | 19 |
| Aeronautics | 1 |
| Astronautics | 3 |
| Automobiles | 1 |
| Aviation | 11 |
| Computer networks | 1 |
| Construction | 1 |
| Energy industry | 2 |
| Information technology | 1 |
| Military | 7 |
| Nautical | 5 |
| Technology | 4 |
| Transport | 1 |