a buabuáu a bóbo
a buabuáu a bóbo .
a WORD_BOUNDARY β w a β w a u WORD_BOUNDARY a WORD_BOUNDARY β o̞ β o̞ WORD_BOUNDARY
a WORD_BOUNDARY b u a b u á u WORD_BOUNDARY a WORD_BOUNDARY b ó b o WORD_BOUNDARY . WORD_BOUNDARY