12.13 Design an interface for general trees—trees with unbounded degree. Make this interface as consistent as possible with BinaryTrees when the degree of a tree is no greater than 2. 12.14 Implement the general tree structure of Problem 12.13 using BinaryTreeNodes. In this implementation, we interpret the left child of a BinaryTreeNode to be the leftmost child, and the right child of the BinaryTree to be the leftmost right sibling of the node.

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