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\item Use the DPLL algorithm (\emph{without} BCP, PL and clause learning) to determine whether or not the set of clauses given is satisfiable. Decide variables in alphabetical order starting with the \textit{negative} phase. If the set of clauses resulted in \texttt{SAT}, give a satisfying model.
\begin{dpllCNFInput}
\item $(\lnot a \lor \lnot b)$
\item $(\lnot a \lor \lnot d)$
\item $(c \lor \lnot b)$
\item $(\lnot c \lor d)$
\end{dpllCNFInput}
% (not a or not b) and (not a or not d) and (c or not b) and (not c or d)