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| voltage spark: 19 phrases in 9 subjects |
| Automobiles | 4 |
| Aviation | 1 |
| Electric machinery | 3 |
| Electronics | 2 |
| Geophysics | 1 |
| Information technology | 1 |
| Metallurgy | 1 |
| Technology | 4 |
| Telecommunications | 2 |
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