open(my $swFH, '>', 'sock_waiting') or die "Cannot open sock_waiting for write:$!\n";
    close $swFH;
    my $live_socket = $socket->accept();
    unlink('sock_waiting') or die "Cannot unlink sock_waiting:$!\n";

##</code><code>##

  print "Hit <ENTER> to quit\n";
  my $quit = <STDIN>;
  while(1){
    if(-f 'sock_waiting'){
      kill 9, $fork_pid;
      print "User quit\n";
      exit;
    }
  }

##</code><code>##

map{$a=1-$_/10;map{$d=$a;$e=$b=$_/20-2;map{($d,$e)=(2*$d*$e+$a,$e**2
-$d**2+$b);$c=$d**2+$e**2>4?$d=8:_}1..50;print$c}0..59;print$/}0..20