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кривая плотности : 14 phrases in 9 subjects |
| Astronautics | 1 |
| Chemistry | 4 |
| Geology | 1 |
| Information technology | 1 |
| Mathematics | 3 |
| Metallurgy | 1 |
| Physics | 1 |
| Statistics | 1 |
| Technology | 1 |
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