Sentence:  While the phonemes 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 <WSD>units</WSD> , 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:  an individual or group or structure or other entity regarded as a structural or functional constituent of a whole