>I remember there being something about certain forms being
>linked so that if you recieved something as a second tier form
>then it removed a certain other shape as the first tier form.
>Is there a list somewhere that shows it, or is that a secret
>info?

I don't believe there is a list, nor is it really secret information, more like common sense.

If you get turtle, you won't get armadillo, since the forms are basically identical.