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  1. or download this
      /([$set]).*\1/ # Look if there is any repetition
  or 
...
# Which combines to

  /([$set]).*\1|[^$set]/
  2. or download this
    my $set = "ABCDEF";
for (<DATA>) {
...
ABC
AA
BB
  3. or download this
    perl -MHTTP::Daemon -MHTTP::Response -MLWP::Simple -e ' ;    # The  
$d = new HTTP::Daemon and fork and getprint $d->url and exit;#spider
($c = $d->accept())->get_request(); $c->send_response( new   #in the
HTTP::Response(200,$_,$_,qq(Just another Perl hacker\n))); ' #  web