Hi Tim,
> Victor Churchill wrote:
> > I recall having fun with these after reading a chapter about them in
> > a Martin Gardner book, I'm sure.
>
> Yes, he describes them in one of his books - highly recommended.
>
> http://www.amazon.co.uk/Hexaflexagons-Probability-Paradoxes-Tower-Hanoi/dp/0521735254/ref=ntt_at_ep_dpt_3
Looks good. It also led me to the square flexagons Victor recalled.
http://mathworld.wolfram.com/Tetraflexagon.html
Cheers, Ralph.
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