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very low frequency : 63 phrases in 15 subjects |
| Automated equipment | 1 |
| Electronics | 7 |
| Geophysics | 10 |
| Household appliances | 1 |
| Makarov | 5 |
| Metrology | 1 |
| Military | 10 |
| Nautical | 1 |
| Oil / petroleum | 1 |
| Physics | 2 |
| Programming | 1 |
| Seismology | 1 |
| Space | 3 |
| Technology | 14 |
| Telecommunications | 5 |