QUOTES RELATED TO THE 9/11 ATTACKS

WHAT DOES "401" MEAN?

You can learn by subscribing and adding your email below. We'll reveal the secret in a confidential message once the contest is over. If you want to give it a shot, respond with your guess for the meaning of "401". The first 50 correct answers win a free signed original of The 401 Book.  

3 HINTS TO GET YOU STARTED:

1.  There are different hints on different pages.

2.  Every alphabet has one.

3.  There is no "K" in the answer.