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differential pulse-code modulation : 32 phrases in 9 subjects |
| Air defense | 1 |
| Earth sciences | 1 |
| Electronics | 18 |
| Geophysics | 1 |
| Information technology | 3 |
| Project management | 1 |
| Space | 3 |
| Technology | 1 |
| Telecommunications | 3 |
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