Biuniqueness is a requirement of classic structuralist phonemics. The Barasano language expresses this importance by way of the phonemics on the word level. Paul L. Garvin did various descriptive work describing the phonemics, morphology, and syllabification in Ktunaxa. The clearest and most important example of Prague school structuralism lies in phonemics. Earlier discussions of phonemics are Trager (1960), Merrifield (1959), Wonderly et al.