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  1. \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.
  2. \begin{dpllCNFInput}
  3. \item $(\lnot a \lor \lnot b)$
  4. \item $(c \lor \lnot d)$
  5. \item $(a \lor \lnot b)$
  6. \item $(c \lor d)$
  7. \end{dpllCNFInput}