From: Dave Thomas <Dave / thomases.com>
> 
> And then I said - heh Dave, why not read this telephone-directory
> sized pile of paper that Andy and you just spent months putting
> together, and lo!, I'm an idiot, as I forgot that '|' is set addition, 
> and '+' is array concatenation, so '-' and '|' are the complementary
> operators.

We'll forgive you, as that stuff very hard to remember.

I tried to look that up at dev.rubycentral.com and could never get 
through...

Hal