Certificate for #1984 ⟨a, b | aaa=a, aaba=a

Completion settings:

[1] aaa=a

Axiom: aaa=a.

Defines rule #1.

Referenced by [3].

[2] aaba=a

Axiom: aaba=a.

Referenced by [3].

[3] aba=aa

Overlap of [1] aaa=a with [2] aaba=a:

a aa aaba

Critical pair: aa=aba.

Flip LHS and RHS.

Defines rule #2.