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do_something() if ...

if ($some_condition) { 
    do_something();
}

   if ($intermediate_array[12] eq "GSM") {               
       if (grep { /^\Q$intermediate_array[11]\E$/ } @subscriber_error 
+) {
...
           $MO_system_error++  if grep { /^\Q$intermediate_array[11]\E
+$/ } @system_error;
       }
   }