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energy alternative : 23 phrases in 13 subjects |
| Business | 2 |
| China | 1 |
| Desert science | 1 |
| Earth sciences | 3 |
| Ecology | 2 |
| Economy | 1 |
| Electronics | 2 |
| Energy industry | 2 |
| Environment | 1 |
| General | 2 |
| Oil / petroleum | 2 |
| United Nations | 2 |
| Wind Energy | 2 |
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