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 three object sets: the ringing set, the rattling set, and the squeaking set. Within each set, the objects are arranged in the following manner: target object (top center), high-similarity test object (bottom left), and the low-similarity test object (bottom right).
