No problem. But I just started to program in lisp less that 2 week ago so I don't know even the simple syntax. Remind yourself when you started to program in lisp.
I also search for everything that I need but I put my question here for the best solution.
Now I define the function for what I need like this :
(defun my-or (li)
(setf k nil)
(loop for l in li collecting (setf k (or k l)))
It works now. But I thought maybe there is a direct solution without defining the new function.
Anyway thank you for your time