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earth orbit : 28 phrases in 9 subjects |
| Astronautics | 5 |
| Communications | 9 |
| Electronics | 2 |
| General | 2 |
| Information technology | 1 |
| Life sciences | 1 |
| Natural sciences | 2 |
| Optics branch of physics | 4 |
| Transport | 2 |
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