koko hikkaitara itai no
koko hikkaitara itai no ?
k o k o WORD_BOUNDARY h i k k a i t a r a WORD_BOUNDARY i t a i WORD_BOUNDARY n o WORD_BOUNDARY
k o k o WORD_BOUNDARY h i k k a i t a r a WORD_BOUNDARY i t a i WORD_BOUNDARY n o WORD_BOUNDARY