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無 : 177 phrases in 13 subjects |
| Aviation | 2 |
| Biology | 1 |
| Communications | 1 |
| Elections | 1 |
| Electronics | 9 |
| Mathematics | 5 |
| Mechanics | 1 |
| Mining | 1 |
| Politics | 2 |
| Radio | 1 |
| Radioengineering | 1 |
| Technology | 149 |
| Telephony | 3 |
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