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Une classe naturelle se définit par un faisceau de traits distinctifs qui spécifient et distinguent de tous les autres un sous-ensemble des segments phonétiques existant dans une langue donnée. Se caractérise donc par le fait que le nombre de traits nécessaires à la spécification de l'ensemble des segments de la classe est inferieur à celui nécessaire pour spécifier chacun des segments en particulier.

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