A tree of the squares
Define a procedure square-tree analogous to the square-list procedure of exercise 2.21. That is, square-list should behave as follows:
(square-tree (list 1 (list 2 (list 3 4) 5) (list 6 7))) (1 (4 (9 16) 25) (36 49))
Define square-tree both directly (i.e., without using any higher-order procedures) and also by using map and recursion.
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