was ist denn lustig
was sein denn lustig
pro cop adv adj
was ist denn lustig ?
v a s WORD_BOUNDARY  ɪ s t WORD_BOUNDARY d ɛ n WORD_BOUNDARY l ʊ s t ɪ ç WORD_BOUNDARY
w a s WORD_BOUNDARY i s t WORD_BOUNDARY d e n n WORD_BOUNDARY l u s t i g WORD_BOUNDARY