\begin{equation} \label{SEFsystem}
        \begin{array}{ll}\displaystyle 
        \text{G}_\text{e}  \mathop{\longrightarrow}^{k_{1}} \text{G}_\text{e} + \text{Eve}, &
        \text{G}_\text{f}  \mathop{\longrightarrow}^{k_{2}} \text{G}_\text{f} + \text{Ftz}, \\ \displaystyle
        \text{Eve} \mathop{\longrightarrow}^{k_{3}}, &
        \text{Ftz} \mathop{\longrightarrow}^{k_{4}}, \\ \displaystyle
        \text{Eve} + \text{G}_\text{f} \mathop{\rightleftarrows}^{k_{5}}_{k_{-5}} \text{G}_{\text{R1}}, &
        \text{Ftz} + \text{G}_\text{e} \mathop{\rightleftarrows}^{k_{6}}_{k_{-6}} \text{G}_{\text{R2}},
    \end{array}
\end{equation} 
