 |
| récurrence: 68 phrases in 17 subjects |
| Astronautics | 7 |
| Astronomy | 3 |
| Automated equipment | 1 |
| Aviation | 5 |
| General | 1 |
| Geology | 1 |
| High energy physics | 1 |
| Hydraulic engineering | 1 |
| Information technology | 6 |
| Mathematics | 19 |
| Mechanic engineering | 2 |
| Military | 1 |
| Natural resourses and wildlife conservation | 2 |
| Radio | 6 |
| Statistics | 2 |
| Technology | 6 |
| Радиоактивное излучение | 4 |