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dispersão : 48 phrases in 11 subjects |
| Antennas and waveguides | 9 |
| Brazil | 1 |
| Chemistry | 1 |
| Economy | 1 |
| Electronics | 6 |
| Environment | 2 |
| General | 2 |
| Mathematics | 22 |
| Radio | 1 |
| Satellite communications | 1 |
| Vacuum tubes | 2 |
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