All List Membership Functions

Count Function (the size of a list)
Equivalent Function (test for identical membership of two lists)
First Function (the first member of a list)
ForEach Function (apply function to each member of the list)
Last Function (the last member of a list)
Member Function (test for membership of a list)
MemberIndex Function (the index position of a member of a list)
MemberNth Function (the nth member of a list)
Subset Function (test that a list subsumes all the members of another list)

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