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use strict;
use warnings;
...
print "\n";
s/(\w*)/lc($1)/e for @x; # why no void warning here?
print @x; # LC - it worked

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