Moreover , the study of speech error confirmed the existence of rules that state how morphemes are to be pronounced or how they should be combined with other morphemes .
Among them are for example phonetic constraints , which prescribe the possible sequences of sounds .
The study of speech error confirmed the existence of rules that state how morphemes are to be pronounced or how they should be combined with other morphemes .
Among them are for example phonetic constraints , which prescribe the possible sequences of sounds .