The phonological development of this form follows special rules.
The expected second person prefix is omitted.
Unstressed /ë/ of the inverse suffix is elided (as usual).
/ë/ is inserted as a transition sound preceding and following third person /-w/, and the resulting /ëwé/ sequence contracts to /a/, apparently in anticipation of the vowel in the following syllable.
The first /w/ of the second person plural suffix is retained as a transition sound; the remaining /w/, in final position following a vowel, is elided as expected.