Ibu mao minum minum Bu
ibu mao minum minum bu .
i b u WORD_BOUNDARY m a o WORD_BOUNDARY m i n u m WORD_BOUNDARY m i n u m WORD_BOUNDARY b u WORD_BOUNDARY
i b u WORD_BOUNDARY m a o WORD_BOUNDARY m i n u m WORD_BOUNDARY m i n u m WORD_BOUNDARY b u WORD_BOUNDARY . WORD_BOUNDARY