Composition of functions can also be generalized to binary relations, where it is sometimes represented using the same formula_5 symbol (as in formula_6).
k ɑ m p ə z ɪ ʃ ə n WORD_BOUNDARY ʌ v WORD_BOUNDARY f ʌ ŋ k ʃ ə n z WORD_BOUNDARY k æ n WORD_BOUNDARY ɔ l s oʊ WORD_BOUNDARY b iː WORD_BOUNDARY d̠ʒ ɛ n ə ɹ ɹ ə l aɪ z d WORD_BOUNDARY t ə WORD_BOUNDARY b aɪ n ə ɹ ɹ i WORD_BOUNDARY ɹ ɪ l eɪ ʃ ə n z WORD_BOUNDARY w ɛ ɹ WORD_BOUNDARY ɪ t WORD_BOUNDARY ɪ z WORD_BOUNDARY s ʌ m t aɪ m z WORD_BOUNDARY ɹ ɛ p ɹ ɪ z ɛ n t ɪ d WORD_BOUNDARY j uː z ɪ ŋ WORD_BOUNDARY ð ə WORD_BOUNDARY s eɪ m WORD_BOUNDARY f ɔ ɹ m j ʊ l ə WORD_BOUNDARY f aɪ v WORD_BOUNDARY s ɪ m b ə l WORD_BOUNDARY æ z WORD_BOUNDARY ɪ n WORD_BOUNDARY f ɔ ɹ m j ʊ l ə WORD_BOUNDARY s ɪ k s WORD_BOUNDARY