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"".eval('"'.$r."'").""

$r = $cgi->param('r');  # If he provides <<".system("rm -rf /").">>,
$r = "You said $r";     #    the user deletes the server's hard drive.

$r = $cgi->param('r');  # If he provides <<$r>>,
$r = "You said $r";     #    the user causes an infinite loop.
                        #    He could bring down the server in a sec.