Prefered C++ Code: Palindromic Graph: Given a tree with n nodes (numbered 1 to n) and n-1 edges. Each edge has a value between 1 and 26(corresponding to A to Z). A pair of nodes is called nice if the string formed by the path between them can be rearranged to be palindromic. Find the number of nice pairs. Eg: Each pair of nodes that have an edge between them is nice(Only one letter) Constraints: Number of nodes<=10^5, Diameter of the tree is less than 1000

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