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poços : 29 phrases in 11 subjects |
| Agriculture | 2 |
| Coal | 3 |
| Construction | 4 |
| Earth sciences | 3 |
| Environment | 1 |
| General | 1 |
| Industry | 2 |
| Life sciences | 6 |
| Mechanic engineering | 5 |
| Patents | 1 |
| Transport | 1 |
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