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