Different functions have been proposed, as follows:
d ɪ f ɹ ə n t WORD_BOUNDARY f ʌ ŋ k ʃ ə n z WORD_BOUNDARY h ʌ v b ɪ n WORD_BOUNDARY p ɹ ə p oʊ z d WORD_BOUNDARY æ z WORD_BOUNDARY f ɑ l oʊ z WORD_BOUNDARY