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$counter = 1;
open(DATA, "export.dat")||die "Cannot open export.dat for read:$!\n";
...
sub output_data{
  #do stuff with temp.dat
}

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