βουνό, ουρανός, η δυση του ηλιου, σύννεφα, φύση, τοπίο, σιλουέτα, σκιά, αντίθεση, παραγωγή καυσίμων και ηλεκτρικής ενέργειας, ηλεκτρική ενέργεια
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