\begin{cofactors}
  $f$ \= $= (((a \land b) \lor (\lnot c \land d)) \lor (e \land \lnot a))$\\
    \>$f_{a}$ \= $= (b \lor (\lnot c \land d))$\\
    \>\>$f_{ab}$ \= $= \true$\\
    \>\>$f_{a\lnot b}$ \= $= (\lnot c \land d)$\\
    \>\>\>$f_{a\lnot bc}$ \= $= \false$\\
    \>\>\>$f_{a\lnot b\lnot c}$ \= $= d$\\
    \>\>\>\>$f_{a\lnot b\lnot cd}$ \= $= \true$\\
    \>\>\>\>$f_{a\lnot b\lnot c\lnot d}$ \= $= \false$\\
    \>$f_{\lnot a}$ \= $= ((\lnot c \land d) \lor e)$\\
    \>\>$f_{\lnot ac}$ \= $= e$\\
    \>\>\>$f_{\lnot ace}$ \= $= \true$\\
    \>\>\>$f_{\lnot ac\lnot e}$ \= $= \false$\\
    \>\>$f_{\lnot a\lnot c}$ \= $= (d \lor e)$\\
    \>\>\>$f_{\lnot a\lnot cd}$ \= $= \true$\\
    \>\>\>$f_{\lnot a\lnot c\lnot d}$ \= $= f_{\lnot ac}$\\
  \end{cofactors}
  The final ROBDD: 
  \begin{center}
  \scalebox{0.75}{
  
  \begin{tikzpicture}[>=latex,line join=bevel,]
    \pgfsetlinewidth{1bp}
  %%
  \pgfsetcolor{black}
    % Edge: f_E -> a0
    \draw [] (84.143bp,268.99bp) .. controls (84.143bp,258.92bp) and (84.143bp,243.47bp)  .. (84.143bp,233.3bp);
    % Edge: f_a -> b1
    \draw [] (135.14bp,210.99bp) .. controls (135.14bp,200.92bp) and (135.14bp,185.47bp)  .. (135.14bp,175.3bp);
    % Edge: f_a!b -> c2
    \draw [] (184.35bp,152.99bp) .. controls (182.53bp,142.8bp) and (179.73bp,127.09bp)  .. (177.91bp,116.93bp);
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (181.43bp,136.61bp) node {\Large$\bullet$};
    % Edge: f_a!b!c -> d3
    \draw [] (225.18bp,94.988bp) .. controls (223.17bp,84.795bp) and (220.09bp,69.087bp)  .. (218.09bp,58.925bp);
    % Edge: f_!a -> c4
    \draw [] (33.143bp,210.99bp) .. controls (33.143bp,200.92bp) and (33.143bp,185.47bp)  .. (33.143bp,175.3bp);
    % Edge: f_!ac -> e5
    \draw [] (33.143bp,94.988bp) .. controls (33.143bp,84.921bp) and (33.143bp,69.474bp)  .. (33.143bp,59.304bp);
    % Edge: f_!a!c -> d6
    \draw [] (84.143bp,152.99bp) .. controls (84.143bp,142.92bp) and (84.143bp,127.47bp)  .. (84.143bp,117.3bp);
    % Edge: a0 -> c4
    \draw [] (77.051bp,213.21bp) .. controls (67.308bp,202.51bp) and (49.886bp,183.38bp)  .. (40.174bp,172.72bp);
    \draw (53.64bp,187.51bp) node {\Large$\circ$};
    % Edge: a0 -> b1
    \draw [] (91.234bp,213.21bp) .. controls (100.98bp,202.51bp) and (118.4bp,183.38bp)  .. (128.11bp,172.72bp);
    % Edge: c4 -> d6
    \draw [] (40.234bp,155.21bp) .. controls (49.978bp,144.51bp) and (67.4bp,125.38bp)  .. (77.112bp,114.72bp);
    \draw (63.645bp,129.51bp) node {\Large$\circ$};
    % Edge: c4 -> e5
    \draw [] (25.797bp,155.3bp) .. controls (18.182bp,146.73bp) and (6.7572bp,132.1bp)  .. (2.1426bp,117.0bp) .. controls (-0.71421bp,107.65bp) and (-0.71421bp,104.35bp)  .. (2.1426bp,95.0bp) .. controls (6.7572bp,79.895bp) and (18.182bp,65.265bp)  .. (25.797bp,56.7bp);
    % Edge: d6 -> e5
    \draw [] (77.051bp,97.213bp) .. controls (67.308bp,86.514bp) and (49.886bp,67.385bp)  .. (40.174bp,56.72bp);
    \draw (53.64bp,71.507bp) node {\Large$\circ$};
    % Edge: d6 -> 6
    \draw [] (84.143bp,94.988bp) .. controls (84.143bp,79.384bp) and (84.143bp,50.854bp)  .. (84.143bp,49.086bp);
    % Edge: e5 -> 4
    \draw [] (31.145bp,36.791bp) .. controls (28.577bp,23.663bp) and (24.413bp,2.3815bp)  .. (24.155bp,1.0642bp);
    % Edge: e5 -> 5
    \draw [] (35.362bp,36.791bp) .. controls (38.216bp,23.663bp) and (42.842bp,2.3815bp)  .. (43.129bp,1.0642bp);
    \draw (38.88bp,20.608bp) node {\Large$\bullet$};
    % Edge: b1 -> c2
    \draw [] (141.19bp,154.74bp) .. controls (148.94bp,144.15bp) and (162.3bp,125.9bp)  .. (170.07bp,115.3bp);
    \draw (158.25bp,131.43bp) node {\Large$\bullet$};
    % Edge: b1 -> 0
    \draw [] (135.14bp,152.99bp) .. controls (135.14bp,137.38bp) and (135.14bp,108.85bp)  .. (135.14bp,107.09bp);
    % Edge: c2 -> d3
    \draw [] (182.39bp,96.25bp) .. controls (189.95bp,85.668bp) and (202.59bp,67.976bp)  .. (210.07bp,57.505bp);
    \draw (198.44bp,73.78bp) node {\Large$\bullet$};
    % Edge: c2 -> 1
    \draw [] (176.14bp,94.988bp) .. controls (176.14bp,79.384bp) and (176.14bp,50.854bp)  .. (176.14bp,49.086bp);
    % Edge: d3 -> 2
    \draw [] (213.92bp,36.791bp) .. controls (211.07bp,23.663bp) and (206.44bp,2.3815bp)  .. (206.16bp,1.0642bp);
    % Edge: d3 -> 3
    \draw [] (218.14bp,36.791bp) .. controls (220.71bp,23.663bp) and (224.87bp,2.3815bp)  .. (225.13bp,1.0642bp);
    \draw (221.29bp,20.692bp) node {\Large$\bullet$};
    % Node: f_E
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (105.64bp,291.0bp) -- (62.64bp,291.0bp) -- (62.64bp,269.0bp) -- (105.64bp,269.0bp) -- cycle;
    \draw (84.143bp,280.0bp) node {$f$};
  \end{scope}
    % Node: a0
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (84.14bp,222.0bp) ellipse (11.0bp and 11.0bp);
    \draw (84.143bp,222.0bp) node {$a$};
  \end{scope}
    % Node: f_a
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (156.64bp,233.0bp) -- (113.64bp,233.0bp) -- (113.64bp,211.0bp) -- (156.64bp,211.0bp) -- cycle;
    \draw (135.14bp,222.0bp) node {$f_{a}$};
  \end{scope}
    % Node: b1
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (135.14bp,164.0bp) ellipse (11.0bp and 11.0bp);
    \draw (135.14bp,164.0bp) node {$b$};
  \end{scope}
    % Node: f_a!b
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (207.64bp,175.0bp) -- (164.64bp,175.0bp) -- (164.64bp,153.0bp) -- (207.64bp,153.0bp) -- cycle;
    \draw (186.14bp,164.0bp) node {$f_{a\lnot b}$};
  \end{scope}
    % Node: c2
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (176.14bp,106.0bp) ellipse (11.0bp and 11.0bp);
    \draw (176.14bp,106.0bp) node {$c$};
  \end{scope}
    % Node: f_a!b!c
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (248.64bp,117.0bp) -- (205.64bp,117.0bp) -- (205.64bp,95.0bp) -- (248.64bp,95.0bp) -- cycle;
    \draw (227.14bp,106.0bp) node {$f_{a\lnot b\lnot c}$};
  \end{scope}
    % Node: d3
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (216.14bp,48.0bp) ellipse (11.0bp and 11.0bp);
    \draw (216.14bp,48.0bp) node {$d$};
  \end{scope}
    % Node: f_!a
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (54.64bp,233.0bp) -- (11.64bp,233.0bp) -- (11.64bp,211.0bp) -- (54.64bp,211.0bp) -- cycle;
    \draw (33.143bp,222.0bp) node {$f_{\lnot a}$};
  \end{scope}
    % Node: c4
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (33.14bp,164.0bp) ellipse (11.0bp and 11.0bp);
    \draw (33.143bp,164.0bp) node {$c$};
  \end{scope}
    % Node: f_!ac
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (54.64bp,117.0bp) -- (11.64bp,117.0bp) -- (11.64bp,95.0bp) -- (54.64bp,95.0bp) -- cycle;
    \draw (33.143bp,106.0bp) node {$f_{\lnot ac}$};
  \end{scope}
    % Node: e5
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (33.14bp,48.0bp) ellipse (11.0bp and 11.0bp);
    \draw (33.143bp,48.0bp) node {$e$};
  \end{scope}
    % Node: f_!a!c
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (105.64bp,175.0bp) -- (62.64bp,175.0bp) -- (62.64bp,153.0bp) -- (105.64bp,153.0bp) -- cycle;
    \draw (84.143bp,164.0bp) node {$f_{\lnot a\lnot c}$};
  \end{scope}
    % Node: d6
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (84.14bp,106.0bp) ellipse (11.0bp and 11.0bp);
    \draw (84.143bp,106.0bp) node {$d$};
  \end{scope}
  %
  \end{tikzpicture}
  
  
  }
  \end{center}
  
  