au au ah ah ah ah ah
au au ah ah ah ah ah ?
 aʊ WORD_BOUNDARY  aʊ WORD_BOUNDARY  aː WORD_BOUNDARY  aː WORD_BOUNDARY  aː WORD_BOUNDARY  aː WORD_BOUNDARY  aː WORD_BOUNDARY
a u WORD_BOUNDARY a u WORD_BOUNDARY a h WORD_BOUNDARY a h WORD_BOUNDARY a h WORD_BOUNDARY a h WORD_BOUNDARY a h WORD_BOUNDARY