The article describes derivative technique which is not yet fully recognized - a prefixal interchangeable derivation. The material comes from 'Slownik gniazd slowotwórczych wspólczesnego jezyka ogolnopolskiego' (Dictionary of derivational nests of contemporary Polish language). The author presents numerical data concerning this technique in contemporary Polish. The most important semantic relations between base and derivative were described and nine semantic groups were distinguished. Finally the article presents problems and perspectives of researches in the area.
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