itaiitai naru kara ne
itaiitai naru kara ne .
i t a i i t a i WORD_BOUNDARY n a r ɯ WORD_BOUNDARY k a r a WORD_BOUNDARY n e WORD_BOUNDARY
i t a i i t a i WORD_BOUNDARY n a r u WORD_BOUNDARY k a r a WORD_BOUNDARY n e WORD_BOUNDARY