$3.$ Write a Python function that takes in two lists and returns the list as a

combination of unique elements present in both lists.

Do not use a set in the program.

Instructions to be followed:

The file containing the source code $($must have a $.$py extension$$example:

filename.py$)$ should be submitted on Blackboard. It should not be submitted as a

Word document. Use the constructs taught in the class. Late work will be

penalized.