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%HoA = (
        flintstones        => [ "fred", "barney" ],
        jetsons            => [ "fred", "jane", "elroy" ],
        simpsons           => [ "fred", "marge", "bart" ],
      );

"fred" is a name that can be found in 3 families = [flintstones, jetso
+ns, simpsons]
e.t.c