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| frecuencia de drenaje | |||
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channel frequency : 71 phrases in 9 subjects |
| Communications | 30 |
| Earth sciences | 2 |
| Electronics | 27 |
| Information technology | 4 |
| Mechanic engineering | 1 |
| Natural sciences | 1 |
| Power lines | 3 |
| Technology | 2 |
| Transport | 1 |
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