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| chemical substances: 33 phrases in 11 subjects |
| Chemistry | 9 |
| Commerce | 1 |
| Environment | 1 |
| Finances | 2 |
| General | 11 |
| Health care | 2 |
| Law | 3 |
| Natural resourses and wildlife conservation | 1 |
| Patents | 1 |
| Research and development | 1 |
| Social science | 1 |
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