a buubaa buubaa buranko
a buubaa buubaa buranko .
a WORD_BOUNDARY b ɯː b aː WORD_BOUNDARY b ɯː b aː WORD_BOUNDARY b ɯ r a n k o WORD_BOUNDARY
a WORD_BOUNDARY b u u b a a WORD_BOUNDARY b u u b a a WORD_BOUNDARY b u r a n k o WORD_BOUNDARY