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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 get_parameters_off_value(self):
 """ Return the string associated to the parameters_off :rtype: string """

        if self.parameters_off_value == None:
            params = self.CM.get_type_list(self.parameters_off)
            self.parameters_off_value = '({})'.format(' '.join(params))
        return self.parameters_off_value