((((f -> (x -> (f (f x)))) (f -> (x -> (f (f x))))) const(<function>)) const(0)) = 4
((((f -> (x -> (f (f x)))) ((f -> (x -> (f (f x)))) (f -> (x -> (f (f x)))))) const(<function>)) const(0)) = 16
((((((f -> (x -> (f (f x)))) (f -> (x -> (f (f x))))) (f -> (x -> (f (f x))))) (f -> (x -> (f (f x))))) const(<function>)) const(0)) = 65536