preorder&inorder

This week, we were doing this preorder and inorder for a TreeList. It is very interesting topic. I am very happy that I understand everything during the lecture. The way it works is very attractive and I enjoy those steps. I think this week's lab is quite hard. Compared with lecture, the lab is difficult for me to do. My partner and me cannot finish half of handout. But it is a good practise. Some recursion function and Treelist makes the 2 hour lab interesting.