na minai to wakannai tte koto
na minai to wakannai tte koto ?
n a WORD_BOUNDARY m i n a i WORD_BOUNDARY t o WORD_BOUNDARY w a k a n n a i WORD_BOUNDARY t t e WORD_BOUNDARY k o t o WORD_BOUNDARY
n a WORD_BOUNDARY m i n a i WORD_BOUNDARY t o WORD_BOUNDARY w a k a n n a i WORD_BOUNDARY t t e WORD_BOUNDARY k o t o WORD_BOUNDARY