> (generate 0)
x
> (generate 0)
x
> (generate 0)
y

> (generate 1)
(sin (* pi y))
> (generate 1)
(/ (+ x y) 2.0)
> (generate 1)
(/ (round (* x 10.0)) 10.0)
> (generate 1)
(* y y)
> (generate 1)
(/ (round (* x 10.0)) 10.0)
> (generate 1)
(cos (* pi x))

> (generate 2)
(/ (+ (* y x) (/ (round (* x 10.0)) 10.0)) 2.0)
> (generate 2)
(sin (* pi (* x x)))
> (generate 2)
(/ (+ (sin (* pi y)) (cos (* pi x))) 2.0)
> (generate 2)
(/ (+ (/ (+ y x) 2.0) (sin (* pi y))) 2.0)
> (generate 2)
(cos (* pi (* y y)))
> (generate 2)
(* (/ (round (* x 10.0)) 10.0) (* y x))

> (generate 3)
(cos (* pi (/ (+ (sin (* pi x)) (/ (+ y x) 2.0)) 2.0)))
> (generate 3)
(/ (+ (sin (* pi (sin (* pi y)))) (cos (* pi (/ (+ y x) 2.0)))) 2.0)
> (generate 3)
(/ (+ (/ (+ (sin (* pi y)) (* x y)) 2.0) (* (* x x) (* y y))) 2.0)
> (generate 3)
(sin (* pi (sin (* pi (/ (round (* y 10.0)) 10.0)))))