This is very difficult. It must be hard to digress. If you have time, you can do it. Basically, you don't do any of the previous questions, just do this. When you finish, you should hand in your paper. There used to be a situation where a student with good grades liked to start with the last difficult problem and finish the last one. There was a blank in front of him and he didn't do it. That student is called obsessive-compulsive disorder.