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    @ids = ("a", "b", "c", "d", "e", "f", "g",);
    
    ...
      use Data::Dumper;
      print Dumper \%counts;
    
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    a
    b
    ...
    f
    f
    f
    
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    e not found
    g not found
    ...
              'd' => 1,
              'a' => 1
            };
    
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    e not found
    g not found
    ...
              'd' => 3,
              'a' => 1
            };