\begin{align}
h^{-1}_{z_0}|G^{z_0}_{l,k}|_{W^{1,1}(B_0)} & \lesssim h^{-1}_{z_0} \Big( |B_{h^2_{z_0}}(z_0)|^{1-\frac{1}{q}}\|\nabla G^{z_0}_{l,k}\|_{L^q(B_{h^2_{z_0}}(z_0) \cap B_0)} + |G^{z_0}_{l,k}|_{W^{1,1}( B_0 \setminus B_{h^2_{z_0}}(z_0)) } \Big) \notag \\ & \lesssim 1 + h^{-1}_{z_0} |G^{z_0}_{l,k}|_{W^{1,1}( B_0 \setminus B_{h^2_{z_0}}(z_0)) }. \label{5.20}
\end{align}
