itai itaiitai ni natta no
itai itaiitai ni natta no .
i t a i WORD_BOUNDARY i t a i i t a i WORD_BOUNDARY n i WORD_BOUNDARY n a t t a WORD_BOUNDARY n o WORD_BOUNDARY
i t a i WORD_BOUNDARY i t a i i t a i WORD_BOUNDARY n i WORD_BOUNDARY n a t t a WORD_BOUNDARY n o WORD_BOUNDARY