um um I don't know
I do know
pro:sub mod v
um um i don't know.
ʌ m WORD_BOUNDARY ʌ m WORD_BOUNDARY aɪ WORD_BOUNDARY d oʊ n t WORD_BOUNDARY n oʊ WORD_BOUNDARY
u m WORD_BOUNDARY u m WORD_BOUNDARY i WORD_BOUNDARY d o n ' t WORD_BOUNDARY k n o w . WORD_BOUNDARY