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| διατήρηση εξαντλήσιμων ενεργειακών πηγών | |||
| εξοικονόμηση ενέργειας | |||
| διατήρηση της ενέργειας | |||
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conservation de l'énergie : 2 phrases in 2 subjects |
| Environment | 1 |
| Physical sciences | 1 |
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