Sentence:  While the <WSD>phonemes</WSD> can be very easily stated , no one is likely to be satisfied with the statement until phonemic occurrences can be related in some way to morphemic units , i. e. until the morphophonemics is worked out , or at least far enough that it seems reasonable to expect success . 
Meaning of the word marked with <WSD> tags:  (linguistics) one of a small set of speech sounds that are distinguished by the speakers of a particular language