〈a, b | ab=aa, bbba=bba〉

Properties

• Infinite non-commutative monoid

Completion parameters

• Reduction order: left-to-right ab

Complete rewriting system

1. ab ⇒ a²
2. b³a ⇒ b²a
3. a⁵ ⇒ a⁴

Right Cayley graph (truncated)

Left Cayley graph (truncated)