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スピア : 25 phrases in 9 subjects |
| Antennas and waveguides | 1 |
| Computers | 4 |
| General | 8 |
| Microsoft | 6 |
| Satellite communications | 1 |
| Sound recording | 2 |
| Thermal Energy | 1 |
| Transformers | 1 |
| Vacuum tubes | 1 |
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