10 -> 10
(+ 5 3 4) -> 12
(- 9 1) -> 8
(/ 6 2) -> 3
(+ (* 2 4) (- 4 6)) -> 6
(define a 3) -> a (3)
(define b (+ a 1)) -> b (4)
(+ a b (* a b)) -> 19
(= a b) -> #f

(if (and (> b a) (< b (* a b)))
    b
    a)
-> 4

(cond ((= a 4) 6)
      ((= b 4) (+ 6 7 a))
      (else 25))
-> (+ 6 7 a) -> 16

(+ 2 (if (> b a) b a))
-> 6

(* (cond ((> a b) a)
         ((< a b) b)
         (else -1))
   (+ a 1))
-> 16