User blog comment:Sait2000/Base-k Arrow Notation/@comment-223.255.230.51-20141219131441/@comment-1605058-20141219185913

Set of all sets doesn't exist. What does, however, is oodle of all sets. And I never even tried to get to things of sort "set of all sets of all sets of all sets". It's entirely not a point of FOOT.

I still can't see what part of it involves guessing.