MEMBER?
Syntax	MEMBER? object1 object2
Explanation	MEMBER? reports TRUE if the first input is an element of the second input; otherwise it reports FALSE.
Examples	MEMBER? "A [A B C]  Result: TRUE  MEMBER? "A [X Y Z]  Result: FALSE  MEMBER? "A "CAT  Result: TRUE  MEMBER? "SALE [BARN SALE]  Result: TRUE  MEMBER? "SALE [[BARN SALE]]  Result: FALSE  MEMBER? 2 14236  Result: TRUE