was ist denn operieren
was ist denn operieren ?
v a s WORD_BOUNDARY  ɪ s t WORD_BOUNDARY d ɛ n WORD_BOUNDARY  oː p eː r iː r ə n WORD_BOUNDARY
w a s WORD_BOUNDARY i s t WORD_BOUNDARY d e n n WORD_BOUNDARY o p e r i e r e n WORD_BOUNDARY