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Use of uninitialized value in concatenation (.) at (eval 13) line 29 (
+#1)
    
    (W uninitialized) An undefined value was used as if it were alread
+y defined.  It was
    interpreted as a "" or a 0, but maybe it was a mistake.  To suppre
+ss this
    warning assign a defined value to your variables.

#!/bin/perl -wT
use diagnostics;
...

  print displayWebPage(table_header($Entities),table_entry($Entities,$
+start, $final));
1;