〈a, b | abb=aab, baa=aa〉

Properties

• Infinite non-commutative monoid

Completion parameters

• Reduction order: left-to-right ab

Complete rewriting system

1. ab² ⇒ a²b
2. ba² ⇒ a²
3. a⁴ ⇒ a³

Right Cayley graph (truncated)

Left Cayley graph (truncated)