Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Venn diagrams representing a transition-by-replacement (Panel A) and a transition-by-omission (Panel B).
Note. In each panel, the horizontally-lined region represents the set of Abandoned Event Components (ECs), the region marked by the square grids represents the set of Retained ECs, and the vertically-lined regions represent the set of New ECs.
