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I guess left(root.left, root.data) includes left(root.left, pdata), and the same as right(root.right, pdata). So we don't need left(root.left, pdata) or right(root.right, pdata).
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I guess left(root.left, root.data) includes left(root.left, pdata), and the same as right(root.right, pdata). So we don't need left(root.left, pdata) or right(root.right, pdata).