/ë/ is inserted as a transition sound between /h/ and /m/ of the MP suffix.
This insertion and /ë/ of the first person agent suffix are rounded to /u/.
/wa/ is realized as /o/, and /w/ is elided in final position after a vowel.
NOTE: The underlying form is the same as that glossed "I know you (two people)." It is not clear that all speakers understand the different phonological treatment as lconstituting a different meaning.