(* (+ 1 2 (- 3 9 12) (/ 200 4 5)) (/ 1 2 3) 2)
(cond [(>= 5 5) "isThree"]
[#false 3]
[(or #true #false) (* 2 3 4)])
(cond
[(cond
[(and #false #true) #false]
[#false 3]
[(or #true #false) #false])
"isThree"]
[#false 3]
[(< 2 3) (* 2 3 4)])
(define x (+ 40 2))
(define y "hallo")
(define-struct p (x y))
(define p1 (make-p 1 2))
(p? p1)
(p-y p1)
(> 2 4)