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\hspace{-0.09cm}\scalebox{0.85}{
\begin{dplltabular}{6}
\dpllStep{1|2|3|4|5|6}
\dpllDecL{0|0|0|0|0|0}
\dpllAssi{ - |$a$|$a, \lnot c$|$a, \lnot c, b$|\makecell{$a, \lnot c, b, $ \\ $e$}|\makecell{$a, \lnot c, b, $ \\ $e, \lnot f$}}
\dpllClause{1}{$a, b$}{$a, b$|\done|\done|\done|\done|\done}
\dpllClause{2}{$a, c$}{$a, c$|\done|\done|\done|\done|\done}
\dpllClause{3}{$d, e$}{$d, e$|$d, e$|$d, e$|$d, e$|\done|\done}
\dpllClause{4}{$\lnot b, \lnot c$}{$\lnot b, \lnot c$|$\lnot b, \lnot c$|\done|\done|\done|\done}
\dpllClause{5}{$e, \lnot f$}{$e, \lnot f$|$e, \lnot f$|$e, \lnot f$|$e, \lnot f$|\done|\done}
\dpllClause{6}{$\lnot d, \lnot f$}{$\lnot d, \lnot f$|$\lnot d, \lnot f$|$\lnot d, \lnot f$|$\lnot d, \lnot f$|$\lnot d, \lnot f$|\done}
\dpllClause{7}{$d, \lnot f$}{$d, \lnot f$|$d, \lnot f$|$d, \lnot f$|$d, \lnot f$|$d, \lnot f$|\done}
\dpllClause{8}{$b, e$}{$b, e$|$b, e$|$b, e$|\done|\done|\done}
\dpllClause{9}{$a, \lnot f$}{$a, \lnot f$|\done|\done|\done|\done|\done}
\dpllBCP{ - | - | - | - | - | - }
\dpllPL{$a$|$\lnot c$|$b$|$e$|$\lnot f$| - }
\dpllDeci{ - | - | - | - | - |SAT}
\end{dplltabular}
}