/ë/ is inserted as a transition sound (1) between /h/ and /m/ of the MP suffix and (2) between /m/ and /w/.
The first of these insertions and the /ë/ of the first person agetn 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 (three or more people)." It is not clear that all speakers understand the different phonological treatment as constituting a different meaning.