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\hspace{-0.09cm}\scalebox{0.85}{
\begin{dplltabular}{4}
\dpllStep{1|2|3|4}
\dpllDecL{0|1|2|3}
\dpllAssi{ - |$\lnot a$|$\lnot a, \lnot b$|$\lnot a, \lnot b, \lnot c$}
\dpllClause{1}{$\lnot a, \lnot b$}{$\lnot a, \lnot b$|\done|\done|\done}
\dpllClause{2}{$\lnot a, \lnot d$}{$\lnot a, \lnot d$|\done|\done|\done}
\dpllClause{3}{$c, \lnot b$}{$c, \lnot b$|$c, \lnot b$|\done|\done}
\dpllClause{4}{$\lnot c, d$}{$\lnot c, d$|$\lnot c, d$|$\lnot c, d$|\done}
\dpllBCP{ - | - | - | - }
\dpllPL{ - | - | - | - }
\dpllDeci{$\lnot a$|$\lnot b$|$\lnot c$|SAT}
\end{dplltabular}
}