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.
The reduction of a set of pages and links by clustering. On the left, local links are black and remote links are blue. On the right, black links are one-way and the red one is a co-link. Clustering clarifies connectivity because it allows the links to go through different pages within the nodes.
