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| класс частоты встречаемости | |||
| класс встречаемости | |||
| frequency class: 10 phrases in 7 subjects |
| Astronomy | 1 |
| Biology | 1 |
| Economy | 1 |
| Immunology | 1 |
| Makarov | 1 |
| Mathematics | 2 |
| Statistics | 3 |
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