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ventilation : 277 phrases in 31 subjects |
| Agriculture | 31 |
| Aviation | 1 |
| Chemistry | 7 |
| Coal | 2 |
| Communications | 1 |
| Construction | 19 |
| Customs | 1 |
| Earth sciences | 7 |
| Economy | 10 |
| Electronics | 10 |
| Energy industry | 1 |
| Environment | 1 |
| Finances | 7 |
| General | 14 |
| Health care | 7 |
| Industry | 9 |
| Labor law | 3 |
| Life sciences | 1 |
| Marketing | 1 |
| Materials science | 3 |
| Mechanic engineering | 27 |
| Medical | 25 |
| Microsoft | 3 |
| Mineral products | 1 |
| Municipal planning | 30 |
| Natural sciences | 3 |
| Patents | 3 |
| Politics | 5 |
| Social science | 3 |
| Technology | 1 |
| Transport | 40 |
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