What is the parent chain for the following compound? 
Definitions:
Efficient
The quality of achieving maximum productivity with minimum wasted effort or expense.
Effective
Producing the desired result or effect with efficiency.
IM
Short for Instant Messaging, a method of sending real-time messages over the internet between two or more people.
User Authentication
A security process that verifies the identity of a user before granting access to a system or application.
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