\item \ifassignmentsheet \points{2}
  \dpllDescriptionAssignmentSheet
\else \prac
  \dpllDescription{negative}
\fi

\begin{dpllCNFInput}
    \item $\{a, b, c\}$
    \item $\{\neg b, \neg c, e\}$
    \item $\{b, e\}$
    \item $\{b, \neg d\}$
    \item $\{\neg c, d\}$
    \item $\{\lnot c, e\}$
    \item $\{\neg a, \neg b, \neg c\}$
    \item $\{a, c, \neg e\}$
\end{dpllCNFInput}