Certificate for #61 ⟨a, b | aa=b, bb=a⟩

Completion settings:

[1] b=aa

Axiom: aa=b.

Flip LHS and RHS.

Defines rule #2.

Referenced by [2].

[2] aaaa=a

Axiom: bb=a.

Reduce LHS:

[1](b)b
[1]⇒ aa(b)
⇒ aaaa

Defines rule #1.