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разность частот : 28 phrases in 9 subjects |
| Aviation | 1 |
| Cables and cable production | 1 |
| Electronics | 1 |
| Energy system | 1 |
| Makarov | 3 |
| Mass media | 17 |
| Medical | 2 |
| Microelectronics | 1 |
| Technology | 1 |
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