  \hen\bird\racoon \zebra\label{16}  T(g) \left(  \begin{array}{l}   z_1 \\    z_2  \end{array}  \right) =   \left(  \begin{array}{ll}    \alpha z_1 + \beta z_2\\    \gamma z_1 + \delta z_2  \end{array}  \right) \,.