(2x^-2y^6)^4 / (4x^3y^-4)^2 =

I got 16x^14/y^16
The computer is saying it's wrong and I don't get it. Even watched a video on similar problem.
Help me!

(2 x^-2 y^6)^4 / (4x^3 y^-4)^2

= (16x^-8 y^24)/(16 x^6 y^-8)
= x^-14 y^32