Figure 1. N-gram pattern sequence example for the sequence C, A, 5, 8, A, 5. A unigram and bigram are shown for this sequence, 
and their associated counts.
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.