Here, "g" composed with "f" would be the function which doubles a number, and "then" subtracts 1 from it. That is:
h ɪ ɹ WORD_BOUNDARY d̠ʒ iː WORD_BOUNDARY k ə m p oʊ z d WORD_BOUNDARY w ɪ ð WORD_BOUNDARY ɛ f WORD_BOUNDARY w ʊ d WORD_BOUNDARY b iː WORD_BOUNDARY ð ə WORD_BOUNDARY f ʌ ŋ k ʃ ə n WORD_BOUNDARY w ɪ t̠ʃ WORD_BOUNDARY d ʌ b ə l z WORD_BOUNDARY ʌ WORD_BOUNDARY n ʌ m b ə ɹ WORD_BOUNDARY æ n d WORD_BOUNDARY ð ɛ n WORD_BOUNDARY s ʌ b t ɹ æ k t s WORD_BOUNDARY w ʌ n WORD_BOUNDARY f ɹ ʌ m WORD_BOUNDARY ɪ t WORD_BOUNDARY ð æ t WORD_BOUNDARY ɪ z WORD_BOUNDARY