(defun distance(p1 p2) (setf x1 (car(p1))) (setf x2 (car(p2))) (setf y1 (cdr(p1))) (setf y2 (cdr(p2))) (sqrt (+ (* (- x1 x2) (- x1 x2)) (* (- y1 y2) (- y1 y2)) ) ) ) (funcall 'distance (3 3) (2 2)))
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