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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 unmanaged_devices(self):
 """ Gets the Unmanaged Devices API client. Returns: UnmanagedDevices: """

        if not self.__unmanaged_devices:
            self.__unmanaged_devices = UnmanagedDevices(self.__connection)
        return self.__unmanaged_devices