Dear Mr. Alan, I've drawn the same ab=cd as below chart. Pls correct me if i'm wrong. image
All clear! Thank you for your patience!
Dear Mr.Alan, Could you pls clarify what is the Valley? I've found this key "Valley" in this awsome thread but there's less info about it. Below is the previous posted chart which shown some notes (Aqua color). Pls give me some advice. Many tks! ...