Consider using the following function

It's helpful to sketch out the general steps you'd need to be able to carry out 
the procedure to solve the problem.

My quick sketch would look like the following:

Since you are checking to see if an element in the first list is also in the 
second list, you'd need to be able to take one element from the first list and 
check to see if it is a member of the second list, then repeat again for each 
of the remaining first list's elements.

How would you code the above procedure?

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