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Finally, once $\hat{D}_{22}$ is obtained, we can obtain an estimate closed-loop transfer function  \begin{equation}  \label{eq:estC}  $\hat{\mC}(z)$ \hat{\mC}(z)  = \mW \left(\frac{z-1}{z+1}\right) \mW\left(\frac{z-1}{z+1}\right)  \end{equation}  and the transfer functions for plant and controller, $\mG(z)$, $\mK(z)$ using \eqref{eq:khg}.