Before sub:$VAR1 = {
          'A' => '1',
          'B' => '2'
        };
After sub:$VAR1 = {
          'F' => '6',
          'A' => '1',
          'B' => '2',
          'C' => '3',
          'D' => '4',
          'E' => '5'
        };