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| core group | |||
| sub-group A of periodic system; even series (periodic system) | |||
| primary group (в базах данных) | |||
| principal group (в базах данных) | |||
| principal group in organic nomenclature (в орг. номенклатуре) | |||
| master record | |||
| главная группа: 28 phrases in 10 subjects |
| Communications | 1 |
| Energy industry | 2 |
| Makarov | 2 |
| Mass media | 2 |
| Mathematics | 1 |
| Medical | 1 |
| Military | 8 |
| NATO | 2 |
| Slang | 2 |
| Technology | 7 |