my $left = "xfafasfsdfasdfasdsfFOOBAR";
   my $right = "FOOBAR4t11";
   # my $concat = "xfafasfsdfasdfasdsfFOOBARFOOBAR4t11";
   my $concat = $left,$right;

##</code><code>##

   my $conc = "xfafasfsdfasdfasdsfFOOBAR4t11";

##</code><code>##

   my $str3 = "AR4t11xysadgsfje";