nan no koto ka wakaranai
nan no koto ka wakaranai .
n a n WORD_BOUNDARY n o WORD_BOUNDARY k o t o WORD_BOUNDARY k a WORD_BOUNDARY w a k a r a n a i WORD_BOUNDARY
n a n WORD_BOUNDARY n o WORD_BOUNDARY k o t o WORD_BOUNDARY k a WORD_BOUNDARY w a k a r a n a i WORD_BOUNDARY