[user_rob]

Yo - I'm not totally stupid - used circles and a table approach to show that there are only 6. Just took the time to write and draw in notebook.

[ColinWright]

Cool - I'd love to see your approach. Could you write it up and post a link? Or feel free to email me, my contact details are in my profile. Alternatively, the article here has a link to my blog, and there's a comment box.

Or just here: [e-mail]

I'm always interested in seeing a better way to do things.