User blog comment:Wythagoras/All my stuff/@comment-5029411-20130715142856/@comment-5029411-20130716175117

Limit ordinal of 5 Rule FGH is theta(Omega^omega).

So you make 6 Rule FGH to reach theta(Omega^Omega). (First 5 Rules is Aarex's 5 Rule FGH Rules.)