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  1. \item \self Consider the following formula from $\mathcal{T}_{E}$.
  2. \begin{equation*}
  3. \phi_{EUF} := \big[ f_y = g_x \land f_y = y \big] \lor \big[ f_y = f_x \land y \neq f_{gy} \big] \lor \big[ f_x = f_y \land f_y = y \big] \lor \big[ f_x = f_{gy} \land f_y \neq y \big]
  4. \end{equation*}
  5. Use the graph-based algorithm to construct an equisatisfiable propositional formula $\phi_{prop}$.
  6. What would you have to change if you would want to check $\phi_E$ for \textit{validity} instead of satisfiability?