〈a, b | abbaab=abba〉

Properties

• Infinite non-commutative monoid

Completion parameters

• Reduction order: left-to-right abc
• Auxiliary generator abba=c

Complete rewriting system

1. cab ⇒ c
2. cba ⇒ c²
3. ab²a ⇒ c
4. cb²a ⇒ ab²c