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# Please design a linear-time algorithm that clones a binary tree T . This algorithm should construct an exact copy of T .

1. Please design a linear-time algorithm that clones a binary tree T. This algorithm should construct an exact copy of T. You are only allowed to use the methods of the Tree and Binary Tree ADTs (i.e., isEmpty, root, parent, children, isInternal, isExternal, isRoot, size, elements, positions, swapElements, replaceElement, leftChild, rightChild, sibling, expandExternal, removeAboveExternal).

a. Describe (in pseudo-code) your algorithm.

b. Analyze its worst-case running time.