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air -classifier : 17 phrases in 8 subjects |
| Aerohydrodynamics | 1 |
| Energy industry | 1 |
| Makarov | 1 |
| Mining | 8 |
| Natural resourses and wildlife conservation | 1 |
| Silicate industry | 1 |
| Technology | 3 |
| Thermal engineering | 1 |
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