User blog comment:Edwin Shade/You Know You're a Googologist When.../@comment-11227630-20171014160901/@comment-32692510-20171014183811

So when Edwin wrote, that googology level 4 would seem to be languages to describe languages, then googology level 5 would be:

[https://www.youtube.com/watch?v=X09oxyIeGuY 2 + 2 is 4, minus 1 that's 3. Quick maths.]