Question: $$ begin{array}{1} text { Change the following traversal into a postorder traversal. } text { template text { void preorder (BinNode * root) }left{begin{array}{1} text

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$$ \begin{array}{1} \text { Change the following traversal into a postorder traversal. } \text { template \text { void preorder (BinNode* root) }\left\{\begin{array}{1} \text { if (root == NULL) return; / Empty subtree, do nothing} W \text { visit (root); } \text { preorder (root->left ()); } \text { preorder (root->right ()); } \text { } } \end{array} ight. \end{array} $$ CS.VS. 11631

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