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| Duo n | |||
| English thesaurus | |||
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| duodenal ulcer | |||
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| Dynamic Unified Optimization | |||
| duodecimo | |||
| DOS under OS | |||
| due-out | |||
| duo: 34 phrases in 14 subjects |
| Automobiles | 4 |
| Communications | 2 |
| Construction | 3 |
| Cultural studies | 1 |
| Earth sciences | 2 |
| Electronics | 1 |
| Engines | 1 |
| General | 1 |
| Industry | 1 |
| Mathematics | 1 |
| Optics branch of physics | 1 |
| Technology | 9 |
| Textile industry | 3 |
| Transport | 4 |