More on the Tree

I think I have a solution.  So I looked it up -- I began at Nado's helpful site and... what was there didn't match my formula.  And it is complicated because it has to separately define 4 terms... I guess it's legit but I'm dumb and want things to be elegant even when they're not.  So I also googled the problem and found another solution.

I had thought my issue was that I needed a formula that I could use to build the flip-tree, so I ignored that mental rule and just wrote a formula that described the tree but which cannot be used to build it.  Which I guess is cheating.  But oh well!  I think I could have eventually reached this other formula online had I stayed calm following my breakthrough, reinstated my rule, and tried again, which makes me happy.  The best thing about the effort I put into this is that I learned how to go about solving these sorts of problems.

If you're interested, I'll leave my solution and the other solutions in the comments.

Onward to more GEB!