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| sprawność energetyczna | |||
| efektywność energetyczna | |||
| eficiência energética: 13 phrases in 7 subjects |
| Energy industry | 4 |
| Environment | 3 |
| Finances | 1 |
| Lighting other than cinema | 1 |
| Nuclear physics | 1 |
| Statistics | 1 |
| Transport | 2 |
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