Figure 2:
An example of guided tree search. Subscripts indicate the order in which a node is generated, and superscripts indicate the depth of the node in the tree.
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.