note Melly <p>Good points - I'll edit the article to include them.</p> <!-- Node text goes above. Div tags should contain sig only --> <div class="pmsig"><div class="pmsig-66612"> <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 </code> Tom Melly, pm@tomandlu.co.uk </div></div> 587193 587746