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dirección : 56 phrases in 12 subjects |
| Antennas and waveguides | 1 |
| Computer networks | 12 |
| General | 14 |
| International Monetary Fund | 2 |
| Lighting other than cinema | 2 |
| Mathematics | 1 |
| Radio | 2 |
| Rail transport | 5 |
| Sound recording | 2 |
| Telecommunications | 13 |
| Telegraphy | 1 |
| Video recording | 1 |
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