imho they don't
since the first two characters are always AA, that's already 2 letters down
and if somebody got the hash and knew that password was a key, they could just guess the rest of the letters like aa(3 guesses)-(5 guesses)-(4 guesses)-(4 guesses)
so it'd be 16 characters to guess (which while it is secure it's still a bad idea to)
don't do it, you cigarettes