ara nani ga ochiteta no
ara nani ga ochiteta no ?
a r a WORD_BOUNDARY n a n i WORD_BOUNDARY g a WORD_BOUNDARY o t̠ʃ i t e t a WORD_BOUNDARY n o WORD_BOUNDARY
a r a WORD_BOUNDARY n a n i WORD_BOUNDARY g a WORD_BOUNDARY o c h i t e t a WORD_BOUNDARY n o WORD_BOUNDARY