Question: Your task is to write a Tree method to_nested_list, which returns a nested list representation of a tree, and the function to_tree, which takes a

Your task is to write a Tree method to_nested_list, which returns a nested list representation of a tree, and the function to_tree, which takes a nested list and returns the Tree that it represents.

def to_tree(obj: Union[int, List]) -> 'Tree': """Return the Tree which  represents.   You may not access Tree attributes directly. This function can be  implemented only using the Tree initializer.

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