\item \ifassignmentsheet \points{2} \fi \applyGB{
    \begin{equation*}
        \phi_{EUF} \quad := \quad  x \neq y \land y = g_x \lor g_x = g_y \rightarrow \neg (g_y \neq z \lor z = f_x) \land \neg (f_x = f_y \land x \neq z)
    \end{equation*}
  }