η δυση του ηλιου, ενεργειακός εφοδιασμός, πόλος ισχύος, ενέργεια, συμμετρία, χιόνι, ηλεκτρική ενέργεια, παραγωγή καυσίμων και ηλεκτρικής ενέργειας, γραμμή ρεύματος, ηλεκτρικό πυλώνα, σούρουπο
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