Write a method called inOrderList that returns a list containing the sequence of values obtained from an inorder traversal of your binary tree of integers. For example, if a variable t refers to reference tree #3, then the call t.inOrderList() should return the list [8, 3, 7, 2, 1] . If the tree is empty, your method should return an empty list.

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Reference Tree #2 2 Reference Tree #1 3 4 9. Reference Tree #3 6, 2.