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\item \BDDToDNF
\begin{center} \begin{forest} for tree={circle, draw, no edge, minimum size=2em, inner sep=0pt, s sep=2mm, l sep=1mm} [$f$, rectangle, draw, tikz={\draw [line] () to (a.north);} [$a$, name=a, tikz={\draw [line] () to (b.north east); \draw [fulldot=.5] () to (c2.north west);} [$b$, name=b, tikz={\draw [dot=.5] () to (e.north); \draw [line] () to (c1.north);} [$c$, name=c1, s sep=20mm, tikz={\draw [line] () to (240:4.2); \draw [fulldot=.5] () to (e.north west);} [,phantom] [$e$, name=e, s sep=10mm, tikz={\draw [fulldot=.5] () to (zero.north); \draw [line] () to (one.north);} [,phantom, name=one] [,phantom, name=zero] ] ] [,phantom] ] [$c$, name=c2, tikz={\draw [line] () to (e.north); \draw [fulldot=.5] () to (d.north);} [,phantom] [$d$, name=d, tikz={\draw [line] () to (e.north east); \draw[dot=.5] () to (300:4.2); } [,phantom] [,phantom] ] ] ] ] \end{forest} \end{center}
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