A list of items can be used to represent a set. The function (member x lst) tests whether the item x is a member of the list lst. If x is a member of lst, the value of member is the tail (a tail of a list is the result of applying cdr to it 0 or more times) of the list lst beginning with the place where x was found; otherwise, the value of member is #f.
(define club '(tom dick harry))
(member 'dick club) = (dick harry)
(member 'fred club) = #f
There are three member functions that use the different equality tests:
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