given two binary trees, is to return true if they are structurally identical, meaning they are made of nodes with the same values arranged in the same way.

Each line of values in input file "tree2Data.txt" represents one linear binary tree, where ' _ ' represents a no value node.

Compare all trees to all other trees.

5 8 7 4 7 3 9 2 8 _ 3 8 5 4 8 _ _ 6 _ _ 5 4 _ _ 7 _ 4 1 _
5 8 7 4 7 3 7 2 8 _ 3 8 5 4 8 _ _ 6 3 _ 5 4 _ _ 7 _ 4 1 _
5 8 7 4 7 3 9 2 8 _ 3 8 5 4 8 _ _ 6 _ _ 5 4 _ _ 7 _ 4 1 _
5 8 7 4 7 3 7 2 8 _ 3 8 5 4 8 _ _ 6 3 _ 5 4 _ _ 7 _ 4 1 _