knopjes en lettertjes
knopjes en lettertjes .
k n ɔ p j ə s WORD_BOUNDARY  ɛ n WORD_BOUNDARY l ɛ t ɛ r tʲ ə s WORD_BOUNDARY
k n o p j e s WORD_BOUNDARY e n WORD_BOUNDARY l e t t e r t j e s WORD_BOUNDARY