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degradação : 79 phrases in 16 subjects |
| Chemistry | 2 |
| Coal | 1 |
| Communications | 12 |
| Computers | 2 |
| Earth sciences | 6 |
| Economy | 2 |
| Electronics | 17 |
| Environment | 20 |
| Industry | 2 |
| Life sciences | 5 |
| Materials science | 1 |
| Medical | 1 |
| Natural sciences | 2 |
| Radio | 2 |
| Technology | 2 |
| Transport | 2 |
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