Solution for exercise 2.26 of SICP:

;Suppose we define x and y to be two lists: (define x (list 1 2 3)) (define y (list 4 5 6)) ;What result is printed by the interpreter in response ;to evaluating each of the following expressions: (append x y) ;(1 2 3 4 5 6) (cons x y) ;((1 2 3) 4 5 6) (list x y) ;((1 2 3) (4 5 6))