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 units , i. e. until the morphophonemics is worked out , or at least far enough that it seems reasonable to expect <WSD>success</WSD> . 
Meaning of the word marked with <WSD> tags:  an event that accomplishes its intended purpose