Question: Write a method called tighten that eliminates branch nodes that have only one child. Each such node should be replaced by its only child. (

Write a method called tighten that eliminates branch nodes
that have only one child. Each such node should be replaced
by its only child. (This can lead to multiple replacements
because the child might itself be replaced.) For example, if a
variable called t refers to reference tree #2, the call of
t.tighten(); should leave t storing the following tree.

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