 $$\begin{aligned}         \begin{bmatrix}         A & 0 & 0 \\         0 & A^T & I \\         {\operatorname{Arw}}({\bm{s}}) & 0 & {\operatorname{Arw}}({\bm{x}})          \end{bmatrix}         \begin{bmatrix}         {