Completion settings:
Axiom: ab=c.
Defines rule #1.
Referenced by [2], [3].
Axiom: aba=c.
Reduce LHS:
Defines rule #2.
Referenced by [3].
Overlap of [2] ca=c with [1] ab=c:
Critical pair: cc=cb.
Flip LHS and RHS.
Defines rule #3.