\item \ifassignmentsheet \points{3}
  \dpllDescriptionAssignmentSheet
\else \prac
  \dpllDescription{negative}
\fi

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