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Use of unitialized value in array element at controlflow.plx
 (#1) line 21
(W uninitialized) An undefined value was used as if it were 
already defined. It was interpreted as a "" or a 0, but maybe it was a
+ mistake. To suppress this warning assign a defined value to your var
+iables.

#!/usr/bin/perl
# controlflow.plx
...
{
  print "Attribute not in HTML file\n";
}