title: List difference in scheme.
body: <p>Who can help me with a code that returns the difference the difference in two different lists i.e the set in A and not in B. like (set-difference '(1 2 4 5 6) '(4 5 6 2 8) is 1. This is was an in-class lab assessment and I wanted to know it would had been done. I know it deals with the aspect of linear time, but I don't really know how to implement that in scheme. </p>