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I see, it returns '(nil) instead of '().

Thank you, I don't know why I didn't see it.

Hello you all. I am doing the excercises I found in this web page: http://www.cs.northwestern.edu/academics/courses/325/exercises/lisp-exs.html Working on number fourth, here the text: Lisp #4: DELETE-CAR (Wilensky, 15) Define (delete-car list) to modify and return list with the first element of lis...