koko ni irereba hairu
koko ni irereba hairu .
k o k o WORD_BOUNDARY n i WORD_BOUNDARY i r e r e b a WORD_BOUNDARY h a i r ɯ WORD_BOUNDARY
k o k o WORD_BOUNDARY n i WORD_BOUNDARY i r e r e b a WORD_BOUNDARY h a i r u WORD_BOUNDARY