4-State Busy Beaver
Turing Machine for 4-state Busy Beaver:
a0 -> b1r a1 -> b1l b0 -> a1l b1 -> c0l c0 -> h1r c1 -> d1l d0 -> d1r d1 -> a0r
Turing Machine for 4-state Busy Beaver:
a0 -> b1r a1 -> b1l b0 -> a1l b1 -> c0l c0 -> h1r c1 -> d1l d0 -> d1r d1 -> a0r