6. Explain the two methods of graph traversing? 7. Define and explain trees and binary trees. 8. What is binary search tree? Write an algorithm to insert and delete an item from a binary search tree. 9. What are different methods of binary tree traversal with examples? 10. Write an algorithm for the in-order traversal of a binary tree. 11. Explain the structure of a threaded tree. What are the conventions of representing threads?