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  1. or download this
    use strict;
    use Data::Dumper;
    ...
     $h_ref{'two'}='thong_'.$tail;
     print 'After add:'.Dumper(\%h_ref);
    }
    
  2. or download this
    In sub:$VAR1 = {
              'zero' => 'start element'
    ...
    Result:$VAR1 = {
              'zero' => 'start element'
            };
    
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