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dióxido de carbono : 39 phrases in 10 subjects |
| Agriculture | 7 |
| Chemistry | 1 |
| Earth sciences | 3 |
| Ecology | 3 |
| Electronics | 3 |
| Environment | 13 |
| Health care | 1 |
| Medical | 2 |
| Natural sciences | 3 |
| Taxes | 3 |
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