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courbe de niveau : 112 phrases in 17 subjects |
| Agriculture | 43 |
| Communications | 2 |
| Construction | 4 |
| Earth sciences | 6 |
| Environment | 4 |
| General | 1 |
| Hydrology | 1 |
| Industry | 1 |
| Life sciences | 14 |
| Mathematics | 1 |
| Natural resourses and wildlife conservation | 2 |
| Soil science | 1 |
| Technology | 18 |
| Transport | 3 |
| Travel | 1 |
| United Nations | 1 |
| Water resources | 9 |
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