(define x (cons (list 1 2) (list 3 4)))
(display x) (newline)
(define y (list 3 4))
(display y) (newline)
(define z (cons (cons 1 2) (cons 3 4)))
(display z) (newline)
(define t (cons (cons (cons 1 2) '()) (cons (cons 3 4) '())))
(display t) (newline)
(define s (cons (cons 1 (cons 2 '())) (cons 3 (cons 4 '()))))
(display s) (newline)
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