SICP 1.1-1.5

 1     10
 2     12
 3     8
 4     3
 5     6
 6     a = 3
 7     b = 4
 8     19
 9     nil
10     4
11     16
12     6
13     16

1 (/ (+ 5
2       4
3       (- 2
4          (- 3
5             (+ 6
6                (/ 4 5)))))
7    (* 3
8       (- 6 2)
9       (- 2 7))

 1     10
 2     12
 3     8
 4     3
 5     6
 6     a = 3
 7     b = 4
 8     19
 9     nil
10     4
11     16
12     6
13     16

1 (define (p) (p))
2 
3 (define (test x y)
4   (if (= x 0)
5       0
6       y))