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| ground system of an antenna; earth system | |||
| sistema de tierra: 15 phrases in 9 subjects |
| Communications | 3 |
| Environment | 2 |
| Fish farming pisciculture | 1 |
| General | 1 |
| Law | 1 |
| Life sciences | 1 |
| Meteorology | 2 |
| Natural sciences | 1 |
| Technology | 3 |
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