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modulation band : 29 phrases in 12 subjects |
| Air defense | 3 |
| Automobiles | 2 |
| Aviation | 3 |
| Electronics | 4 |
| Geophysics | 2 |
| Information technology | 1 |
| Oil / petroleum | 3 |
| Radio | 2 |
| Shipbuilding | 2 |
| Space | 3 |
| Technology | 2 |
| Telecommunications | 2 |
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