Sorry for asking more questions, but are we required to submit a sample for review, or is it just optional? Also, will they let you know when they receive your submission, and if so, about how long will it take? The only e-mail I got from them was when I registered (it says "以下は2016/10/02 (Sun) 14:09:59にお送りいただいたメールの複製です。" and then the registration information), and I'm getting antsy.