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my $fork_pid = fork();
if($fork_pid == 0){
...
  my $quit = <STDIN>;
  kill 9, $fork_pid;
}

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