Only using these functions/constructs in Scheme:

define lambda cond else empty empty? first rest cons list

list? = equal? and or not + - * / < <= > >=

create the function described below.

(remove-duplicates L) The remove-duplicates function takes a simple list L and returns a new list with all of the duplicate objects in L removed.

Examples:

(remove-duplicates '(1 2 3)) => (list 1 2 3)

(remove-duplicates '(1 2 1 4)) => (list 2 1 4) -or- (list 1 2 4)

(remove-duplicates '(3 3 3 3 3)) => (list 3)