Small ternary form, also called simple ternary form, is the most basic ternary form, consisting of an opening section, a contrasting second section, and finally a third section that is a repetition of, or similar to, the first section. It is usually schematized as A-B-A. The broad categories of ternary form variants include complex ternary form, in which each section is itself in ternary form, such as (A-B-A)(C-D-C)(A-B-A), and extended ternary form, an example of which is (A-A-B-B-A)(C-C-D-C)(A-B-A).