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 %Real_time = (
     0 => 'No',    1 => 'Yes',
...
 %Date_format = (
     0 => 'MM/DD/YY',    1 => 'DD/MM/YY',    2 => 'YY/MM/DD',
 );

   BEGIN {
   no strict 'refs';
   no warnings 'uninitialized';
...
   }
}