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  1. or download this
    use vars qw($var1 $var2 $var3);
    {
    ...
        $var2 = 'Two';
        $var3 = 'Three';
    }
    
  2. or download this
    use vars qw($var1 $var2 $var3);
    initialize();
    ...
        $var2 = 'Two';
        $var3 = 'Three';
    }