The main practical difference, afaik, is that if you edit a link, then you are editing the original as well (well, they are the same thing).

However, if you edit a copied file, then the original is unchanged.

Gotta go - my granny wants to learn to suck eggs...

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
[download]