Good day Haejin, After buying the book and studying it for a big part. I made a NEO chart . It only differs with yours. If you have time, and I understand if you do not. Can you see what I have done wrong ? Wave 3 is not the shortest wave 4 does not overlap with wave 1. But I am thinking still need to do some studying on corrections? Even if you do not respond I wish you a very pleasant day!