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1 | solar heat for homes | 1 | 1 |
2 | building a mini greenhouse using home supplies | 1 | 1 |
3 | how to build your own car | 1 | 1 |
4 | cambodia's nonrenewable energy | 1 | 1 |
5 | how to build a hydroelectricity model | 1 | 1 |