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.
Three truth sets. The underlying graph on the left has 4 v-structures (at nodes 4, 5, 7, and 8), the middle has 3 v-structures (at nodes 4, 5, and 8), and on the right has 2 v-structures (at nodes 7 and 8). The nodes that v-structures are formed in are highlighted in the graphs.
