Bill Gosper writes:
Nice work! This is the first solution by an actual customer!
> There are two disks that can be swapped
>
You have the first copy of the four 80% models I made. I actually wouldn't have sold them had I known there were multiple solutions. If this were the intended solution, I would have noticed something so simple as a two-piece swap.
I'm not sure how much more you want me to reveal. I can tell you:
Whether or not these two solutions were known,
How many solutions to the 80%er are known,
How near or far Greg's are wrt the intended,
How to decode the bottom.
I'm willing, but perhaps not able, to tell you all the known solutions, as I no longer own an 80%er.
In response to learning of the unintended solutions, I sold two 81%ers, based on a solution by Emma Cohen. Before I could make any more, she found a solution that led to the 82%er, which still remains otherwise unsolved! (Cheny Xu, who solved many of my earlier designs in 5-7 min, has been working on the 82%er for *months*.)
All three versions have the same cavity--just successively larger pieces.
