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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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