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| combustíveis: 69 phrases in 13 subjects |
| Chemistry | 2 |
| Ecology | 2 |
| Economy | 9 |
| Energy industry | 7 |
| Environment | 18 |
| Forestry | 3 |
| General | 3 |
| Mechanic engineering | 1 |
| Natural sciences | 1 |
| Nuclear physics | 5 |
| Technology | 2 |
| Transport | 15 |
| Waste management | 1 |