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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 wrap(self, cause):
 """ Wraps another exception into an application exception object. If original exception is of ApplicationException type it is returned without changes. Otherwise a new ApplicationException is created and original error is set as its cause. :param cause: an original error object :return: an original or newly created ApplicationException """

        if isinstance(cause, ApplicationException):
            return cause
            
        self.with_cause(cause)
        return self