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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 getControllerRoleForTrackedDeviceIndex(self, unDeviceIndex):
 """Returns the controller type associated with a device index. This function is deprecated in favor of the new IVRInput system."""


        fn = self.function_table.getControllerRoleForTrackedDeviceIndex
        result = fn(unDeviceIndex)
        return result