bu bu bu bu bu
bu bu bu bu bu
bab bab bab bab bab
bu bu bu bu bu .
β u WORD_BOUNDARY β u WORD_BOUNDARY β u WORD_BOUNDARY β u WORD_BOUNDARY β u WORD_BOUNDARY
b u WORD_BOUNDARY b u WORD_BOUNDARY b u WORD_BOUNDARY b u WORD_BOUNDARY b u WORD_BOUNDARY . WORD_BOUNDARY