LispForum

Thank you, your reply was really useful. I think I'm getting the hang of it

Thank you for your reply. I am rather new to Lisp, though, and I am not sure I completely understood your advice. Could you tell me a little more about that flatten function? And also, will two procedures be enough for the whole program?

Hello. I need to right a recursive procedure that receives a list (could be nested) or an atom as input and returns a new list in which only the atoms of the input data are extracted. Further, if there are repeating atoms only one of them must be listed. It should look something like this: (extract-...