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de aer : 119 phrases in 14 subjects |
| Agriculture | 10 |
| Animal husbandry | 1 |
| Chemistry | 7 |
| Communications | 2 |
| Construction | 74 |
| Economy | 1 |
| Entomology | 1 |
| Environment | 3 |
| Forestry | 5 |
| Natural sciences | 2 |
| Soil science | 1 |
| Technology | 6 |
| Transport | 5 |
| Ventilation | 1 |
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