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.
Examples of figures and code systems from Selten and Warglien (2007). (Top row) Example of six visual tokens made up of two shapes and three inserts. (Bottom row) Example of a compositional grammar in which R signifies circle, S signifies triangle, M signifies • and Z signifies +. (Adapted from Selten and Warglein, 2007).
