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eaux résiduaires : 51 phrases in 10 subjects |
| Agriculture | 1 |
| Chemistry | 3 |
| Construction | 3 |
| Environment | 33 |
| General | 2 |
| Natural sciences | 2 |
| Politics | 1 |
| Textile industry | 2 |
| Transport | 2 |
| Water supply | 2 |
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