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| vekselsending; serie af alternerende marks and spaces | |||
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| halvbølge | |||
| alternering; alternation | |||
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alternancias : 30 phrases in 13 subjects |
| Communications | 2 |
| Construction | 1 |
| Economics | 1 |
| Education | 7 |
| Electronics | 1 |
| General | 5 |
| Information technology | 1 |
| Law | 3 |
| Life sciences | 1 |
| Mathematics | 2 |
| Medical | 1 |
| Microsoft | 3 |
| Scientific | 2 |