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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def caller_folder():
 """ Returns the folder where the code of the caller's caller lives """

    import inspect
    caller_file = inspect.stack()[2][1]
    if os.path.exists(caller_file):
        return os.path.abspath(os.path.dirname(caller_file))
    else:
        return os.path.abspath(os.getcwd())