Figure 2

Production rules for Simple Elementary Ordered Tree Grammar (SEOTG). (RHB) Horizontal bisection rules, (RVB) Vertical bisection rules, (RNC) Replacement rules with a terminal symbol. The uppercase letters, ’A’, ’B’, and ’C’ indicate non-terminal symbols, while the lowercase letter, ’a’, indicates a terminal symbol. The circle filled in black indicates a tag.