Y-parameter for following network is given as

$$\begin{bmatrix}\frac{9(s + 1)}{8} & \frac{-3(2s + 2)}{8} \\\frac{-3(2s + 2)}{8} & \frac{9(s + 1)}{8} \end{bmatrix}$$

$$\begin{bmatrix}\frac{9(2s + 1)}{8} & \frac{-3(2s + 1)}{8} \\\frac{-3(2s + 1)}{8} & \frac{9(2s + 1)}{8} \end{bmatrix}$$

$$\begin{bmatrix}\frac{9(2s + 1)}{8} & \frac{-3(2s + 1)}{16} \\\frac{-3(2s + 1)}{16} & \frac{9(2s + 1)}{8} \end{bmatrix}$$

$$\begin{bmatrix}\frac{9(s + 1)}{8} & \frac{-3(2s + 1)}{8} \\\frac{-3(2s + 1)}{8} & \frac{9(s + 1)}{8} \end{bmatrix}$$