a buabá a babá a buábua a babá
a buabá a babá a buábua a babá .
a WORD_BOUNDARY β w a β a WORD_BOUNDARY a WORD_BOUNDARY β a β a WORD_BOUNDARY a WORD_BOUNDARY β w a β w a WORD_BOUNDARY a WORD_BOUNDARY β a β a WORD_BOUNDARY
a WORD_BOUNDARY b u a b á WORD_BOUNDARY a WORD_BOUNDARY b a b á WORD_BOUNDARY a WORD_BOUNDARY b u á b u a WORD_BOUNDARY a WORD_BOUNDARY b a b á WORD_BOUNDARY . WORD_BOUNDARY