/nn/ coalesces to a single occurrence /n/.
Unstressed /ë/ of the inverse suffix is elided.
/w/ of the root is devoiced and realized as /h/ before /k/, and the preceding vowel is laxed in a closed syllable.
/ë/ is inserted as a transition sound (1) between /k/ and /w/ and (2) between /w/ and /n/. The first of these is rounded to /u/ before /w/.