Most impulses contain what Elliott called an extension. Extensions are elongated impulses with exaggerated subdivisions. The vast majority of impulse waves do contain an extension in one and only one of their three motive subwaves (1, 3 or 5). The diagrams in Figure 4, illustrating extensions, will clarify this point. Often the third wave of an extended third wave is an extension, producing a profile such as shown in Figure 5.