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Cognates in lingueestics is wirds that haes a common oreegin. Thay micht can occur athin a leid, sicas shirt an skirt as twa Inglis wirds comin frae the Proto-Indo-European wird *sker-, meanin "tae cut". Thay micht can occur athort langages an aw, e.g. nicht an German Nacht as descendants o Proto-Indo-European *nokt-, "nicht".