CREST
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Energie et mouvement
photo: https://upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Lightning_over_Oradea_Romania_2.jpg/720px-Lightning_over_Oradea_Romania_2.jpg?download
photo: https://upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Lightning_over_Oradea_Romania_2.jpg/720px-Lightning_over_Oradea_Romania_2.jpg?download
