nani ni natta no kana
nani ni natta no kana ?
n a n i WORD_BOUNDARY n i WORD_BOUNDARY n a t t a WORD_BOUNDARY n o WORD_BOUNDARY k a n a WORD_BOUNDARY
n a n i WORD_BOUNDARY n i WORD_BOUNDARY n a t t a WORD_BOUNDARY n o WORD_BOUNDARY k a n a WORD_BOUNDARY