there are two interesting aspects of the process in navajo. firstly, morphemes that participate are domain-specific, only the last two domains are affected (conjunct + stem). verbal morphemes from the outer or 'disjunct' domain are not affected by the process: the process is morphologically conditioned. secondly, the lateral affricate and fricative (, and ) appear with both values. young and morgan (1987) offer an extensive sets of examples of this type of morpheme alternation in navajo.