 |
| systems concept: 44 phrases in 15 subjects |
| American usage, not spelling | 1 |
| Astronautics | 4 |
| Automated equipment | 3 |
| Aviation | 3 |
| Computer networks | 2 |
| Diplomacy | 1 |
| Education | 1 |
| Mathematics | 1 |
| Military | 18 |
| Power system protection | 1 |
| Programming | 5 |
| Seismology | 1 |
| Surveying | 1 |
| Telecommunications | 1 |
| Weapons of mass destruction | 1 |