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| естественное образование (MichaelBurov); естественное строение (MichaelBurov) | |||
| естественная структура | |||
| natural structure: 11 phrases in 6 subjects |
| Building structures | 1 |
| Grammar | 1 |
| Makarov | 4 |
| Natural resourses and wildlife conservation | 1 |
| Programming | 3 |
| Seismology | 1 |