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| half-duplex (Two-way electronic communication that takes place in only one direction at a time) | |||
| half-duplex; semi-duplex | |||
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| simplex; half duplex | |||
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| half duplex; simplex | |||
| semi-duplex: 16 phrases in 4 subjects |
| Communications | 9 |
| Computers | 2 |
| Information technology | 3 |
| Statistics | 2 |