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$unique_ids = scalar(grep {defined $_} @normal_array);

     %HoA = (
    flintstones => [ "fred", "barney","barney", "nick", "john", "barne
+y" ],
    jetsons => [ "george", "jane", "elroy", "mike", "elias" ],
    simpsons => [ "homer", "marge", "bart", "jack", "homer" ],
    );