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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 appliance_node_information(self):
 """ Gets the ApplianceNodeInformation API client. Returns: ApplianceNodeInformation: """

        if not self.__appliance_node_information:
            self.__appliance_node_information = ApplianceNodeInformation(self.__connection)
        return self.__appliance_node_information