Suppose $R$ is the solid bounded by the plane $z = 2 x$, the surface $z = x^2$, and the planes $y = 0$ and $y = 4$. Write an iterated integral in the form below to find the volume of the solid $R$.

$\displaystyle \iiint\limits_R f(x,y,z) \, dV = \int_A^B \!\! \int_C^D \!\! \int_E^F$ $\, dz \, dy \, dx$
with limits of integration

A =
B =
C =
D =
E =
F =