One day, you have some trouble with reading book. So, you go to buy a glasses. At ALMOST BEAUTIFUL
OPTICS, the first step is to see an ophthalmologist (eye doctor) who will give you the prescription. Then, you
go to select the frame and place order for your glasses. After the glasses is made, you went back to pay the
money and pick up the glasses.
3.1. How many actor are there? And who