Question: In Lisp Write a function f9 that removes duplicates from a list. Example: (f9 (c (a b) c d (a b))) returns (c (a b)

In Lisp Write a function f9 that removes duplicates from a list. Example: (f9 (c (a b) c d (a b))) returns (c (a b) d)

Function has to test the example and has to have the same return as in the example

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