Question: Write Prolog rules to define a version of the member predicate that will generate all members of a list during backtracking, but without generating duplicates.

Write Prolog rules to define a version of the member predicate that will generate all members of a list during backtracking, but without generating duplicates. Note that the cut and\+ based versions of Example 12.20 will not suffice; when asked to look for an uninstantiated member, they find only the head of the list.

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