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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 (d.north);}
[$b$, name=b, tikz={\draw [fulldot=.5, bend left] () to (c.north east); \draw [line, bend right] () to (c.north west);}
[$c$, name=c, s sep=20mm, tikz={\draw [line] () to (250:4); \draw [fulldot=.5] () to (d.north west);}
[,phantom]
[$d$, name=d, s sep=10mm, tikz={\draw [fulldot=.5] () to (287:5); \draw [line] () to (275:4.8);}]
]
]
[,phantom]
]
]
\end{forest}
\end{center}