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ion source : 92 phrases in 12 subjects |
| Agriculture | 2 |
| Aviation | 1 |
| Chemistry | 10 |
| Earth sciences | 4 |
| Ecology | 3 |
| Electronics | 38 |
| General | 1 |
| Geology | 1 |
| Geophysics | 1 |
| Metallurgy | 2 |
| Space | 6 |
| Technology | 23 |
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