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Repeat Exercise C-8.47, implementing the postorder method of the AbstractTree class. Exercise…

Repeat Exercise C-8.47, implementing the postorder method of the AbstractTree class. Exercise…

Repeat Exercise C-8.47, implementing the postorder method of the AbstractTree class.Exercise C-8.47To implement the preorder method of the AbstractTree class, we relied on the convenience of creating a snapshot. Reimplement a preorder method that creates a lazy iterator. (See Section 7.4.2 for discussion of iterators.)