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| funzionamento di due tubi in controfase silenzioso | |||
| B: 33 phrases in 13 subjects |
| Communications | 1 |
| Earth sciences | 3 |
| Electronics | 3 |
| General | 2 |
| Information technology | 2 |
| Law | 3 |
| Mathematics | 2 |
| Medical | 5 |
| Obsolete / dated | 1 |
| Politics | 3 |
| Radio | 1 |
| Statistics | 6 |
| Transport | 1 |
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