Question: A non-empty tree is made up of nodes: the root, and all of the nodes in its subtrees. Define a Scheme procedure (tree-node-count t) that

A non-empty tree is made up of nodes: the root, and all of the nodes in its subtrees. Define a Scheme procedure (tree-node-count t) that calculates the number of nodes in tree t. It should also work for empty trees.

Language is racket, needs to count the nodes of a binary tree.

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