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eficiencia : 42 phrases in 10 subjects |
| Antennas and waveguides | 5 |
| Automatic control | 1 |
| Chemistry | 1 |
| Economy | 1 |
| Energy industry | 9 |
| Environment | 8 |
| Finances | 2 |
| Mathematics | 9 |
| Microsoft | 2 |
| Statistics | 4 |
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