Question: Write Prolog rules for the following set operations (do NOT use any pre-defined predicates): union(A,B,C): returns the union of sets A and B. C is

Write Prolog rules for the following set operations (do NOT use any pre-defined predicates):

union(A,B,C): returns the union of sets A and B. C is used to store the result.

Example

?- union([1, 2, 3], [2, 3, 7, 9], U).

yes, U = [1, 2, 3, 7, 9]

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