〈a, b | abb=aab, aaaa=a〉

Properties

• Infinite non-commutative monoid

Completion parameters

• Reduction order: left-to-right ab

Complete rewriting system

1. ab² ⇒ a²b
2. a⁴ ⇒ a

Right Cayley graph (truncated)

Left Cayley graph (truncated)