〈a, b | aaa=aa, abba=bb〉

Properties

• Infinite non-commutative monoid

Completion parameters

• Reduction order: left-to-right ab

Complete rewriting system

1. a³ ⇒ a²
2. ab² ⇒ b²
3. b²a ⇒ b²

Right Cayley graph (truncated)

Left Cayley graph (truncated)