dakara nani ga atta no
dakara nani ga atta no ?
d a k a r a WORD_BOUNDARY n a n i WORD_BOUNDARY g a WORD_BOUNDARY a t t a WORD_BOUNDARY n o WORD_BOUNDARY
d a k a r a WORD_BOUNDARY n a n i WORD_BOUNDARY g a WORD_BOUNDARY a t t a WORD_BOUNDARY n o WORD_BOUNDARY