(setq a 'x)
(setq b '(y z))
(setq c (cons a b))
c

a
b
c
(car c)
(cdr c)
(car (cdr c))


(defun pow (n1 n2)
       (cond ((zerop n2) 1)
	     (t (times n1 (pow n1 (sub1 n2))))
       ) )

(pow 2 3)
(pow 5 7)
(pow 234 0)

(defun rember (a lat)
       (cond ((null lat) ())
	     ((eq (car lat) a) (cdr lat))
	     (t (cons (car lat) (rember a (cdr lat))))
       ) )

(rember 'eggs '(bacon lettuce eggs benedict ham))
(rember 'x c)

(defun multiins (old new lat)
       (cond ((null lat) ())
	     ((eq (car lat) old) (cons (car lat)
				    (cons new (multiins old new (cdr lat)))))
	     (t (cons (car lat) (multiins old new (cdr lat))))
       ) )

(multiins 'adler 'marc '(adler shoes adler pants adler shirts))
(multiins 'x 'w c)


(defun pow2 (n1 n2)
       (prog (a b prod)
	     (setq a n1)
	     (setq b n2)
	     (setq prod 1)
	loop (cond ((zerop b) (return prod)))
	     (setq prod (times prod a))
	     (setq b (sub1 b))
	     (go loop)
	) )

(pow2 2 3)
(pow2 5 7)
(pow2 234 0)
(pow2 11.34 3)

(defun double (n) (times n 2))
(defun square (n) (times n n))
(defun testfun (n)
       (funcall (cond ((greaterp n 100) 'double)
		      (t 'square) )
	n)  )

(testfun 13)
(testfun 99)
(testfun 130)
(testfun 6547)

