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\item \ifassignmentsheet \points{5} \fi
Use the lazy encoding approach to check whether the formula $\varphi$ in $\EUF$ is satisfiable.
\begin{align*}
\varphi = &(\clause{\lnot (y=f(x)); \lnot (y=f(y))}) \land (\clause{(y=f(x)); (y=f(y))})~\land\\
&(\clause{(f(x)=z); (f(y)=x); \lnot (f(y)=z)}) \land (\clause{(y=f(y)); \lnot (z=x)})~\land\\
&(\clause{(f(y)=x); (z=x); (f(y)=z)}) \land (\clause{(y=f(x)); (z=x)})
\end{align*}