How to write a scheme function that takes two lists and returns four lists

Question

I have 2 lists of elements \'(a b c) \'(d b f) and want to find differences, union, and intersection in one result. Is that possible? How?

I wrote a member function

Answer 1

Sure it's possible. Here are a couple hints:

1. what's the result of combining a list and an empty list?
2. You don't have to do it all at once. Take a piece at a time.