"Gavin Kistner" <gavin / refinery.com> wrote in message
> Thanks for pointing that out. The correct code should be:
>
> @@lookup[@o1].delete(@o2) if @@lookup[@o1]
> @@lookup[@o2].delete(@o1) if @@lookup[@o2]
>

That is exactly what I did ... will let you know when I get it
to work with visualization (using wxRuby).

Thanks,
-- shanko