\begin{cofactors}
  $f$ \= $= (((q \land \lnot s) \lor (s \land (\lnot r \lor p))) \lor ((p \land q) \land r))$\\
    \>$f_{p}$ \= $= (((q \land \lnot s) \lor s) \lor (q \land r))$\\
    \>\>$f_{pq}$ \= $= \true$\\
    \>\>$f_{p\lnot q}$ \= $= s$\\
    \>\>\>$f_{p\lnot qs}$ \= $= \true$\\
    \>\>\>$f_{p\lnot q\lnot s}$ \= $= \false$\\
    \>$f_{\lnot p}$ \= $= ((q \land \lnot s) \lor (s \land \lnot r))$\\
    \>\>$f_{\lnot pq}$ \= $= (\lnot s \lor (s \land \lnot r))$\\
    \>\>\>$f_{\lnot pqr}$ \= $= \lnot f_{p\lnot q}$\\
    \>\>\>$f_{\lnot pq\lnot r}$ \= $= \true$\\
    \>\>$f_{\lnot p\lnot q}$ \= $= (s \land \lnot r)$\\
    \>\>\>$f_{\lnot p\lnot qr}$ \= $= \false$\\
    \>\>\>$f_{\lnot p\lnot q\lnot r}$ \= $= f_{p\lnot q}$\\
  \end{cofactors}
  The final ROBDD: 
  \begin{center}
  \scalebox{0.75}{
  
  \begin{tikzpicture}[>=latex,line join=bevel,]
    \pgfsetlinewidth{1bp}
  %%
  \pgfsetcolor{black}
    % Edge: f_E -> p0
    \draw [] (123.5bp,268.99bp) .. controls (123.5bp,258.92bp) and (123.5bp,243.47bp)  .. (123.5bp,233.3bp);
    % Edge: f_p -> q1
    \draw [] (174.5bp,210.99bp) .. controls (174.5bp,200.92bp) and (174.5bp,185.47bp)  .. (174.5bp,175.3bp);
    % Edge: f_p!q -> s2
    \draw [] (74.288bp,94.988bp) .. controls (76.108bp,84.795bp) and (78.913bp,69.087bp)  .. (80.728bp,58.925bp);
    % Edge: f_!p -> q3
    \draw [] (72.5bp,210.99bp) .. controls (72.5bp,200.92bp) and (72.5bp,185.47bp)  .. (72.5bp,175.3bp);
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (72.5bp,195.3bp) node {\Large$\bullet$};
    % Edge: f_!pq -> r4
    \draw [] (123.5bp,152.99bp) .. controls (123.5bp,142.92bp) and (123.5bp,127.47bp)  .. (123.5bp,117.3bp);
    \draw (123.5bp,137.3bp) node {\Large$\bullet$};
    % Edge: f_!p!q -> r5
    \draw [] (21.5bp,152.99bp) .. controls (21.5bp,142.92bp) and (21.5bp,127.47bp)  .. (21.5bp,117.3bp);
    \draw (21.5bp,137.3bp) node {\Large$\bullet$};
    % Edge: p0 -> q3
    \draw [] (116.41bp,213.21bp) .. controls (106.66bp,202.51bp) and (89.243bp,183.38bp)  .. (79.531bp,172.72bp);
    \draw (92.998bp,187.51bp) node {\Large$\bullet$};
    % Edge: p0 -> q1
    \draw [] (130.59bp,213.21bp) .. controls (140.34bp,202.51bp) and (157.76bp,183.38bp)  .. (167.47bp,172.72bp);
    % Edge: q3 -> r5
    \draw [] (65.409bp,155.21bp) .. controls (55.665bp,144.51bp) and (38.243bp,125.38bp)  .. (28.531bp,114.72bp);
    \draw (41.998bp,129.51bp) node {\Large$\circ$};
    % Edge: q3 -> r4
    \draw [] (79.591bp,155.21bp) .. controls (89.335bp,144.51bp) and (106.76bp,125.38bp)  .. (116.47bp,114.72bp);
    % Edge: r5 -> s2
    \draw [] (29.226bp,97.908bp) .. controls (40.895bp,87.195bp) and (62.899bp,66.995bp)  .. (74.644bp,56.212bp);
    \draw (59.911bp,69.737bp) node {\Large$\bullet$};
    % Edge: r5 -> 4
    \draw [] (21.5bp,94.988bp) .. controls (21.5bp,79.384bp) and (21.5bp,50.854bp)  .. (21.5bp,49.086bp);
    % Edge: r4 -> s2
    \draw [] (117.45bp,96.737bp) .. controls (109.7bp,86.149bp) and (96.338bp,67.901bp)  .. (88.575bp,57.297bp);
    % Edge: r4 -> 3
    \draw [] (123.5bp,94.988bp) .. controls (123.5bp,79.384bp) and (123.5bp,50.854bp)  .. (123.5bp,49.086bp);
    \draw (123.5bp,69.086bp) node {\Large$\bullet$};
    % Edge: q1 -> s2
    \draw [] (171.65bp,152.93bp) .. controls (167.29bp,138.85bp) and (157.95bp,113.01bp)  .. (143.5bp,95.0bp) .. controls (128.72bp,76.585bp) and (105.0bp,61.54bp)  .. (91.923bp,54.08bp);
    \draw (109.2bp,64.149bp) node {\Large$\circ$};
    % Edge: q1 -> 0
    \draw [] (177.46bp,153.25bp) .. controls (182.18bp,137.7bp) and (190.93bp,108.87bp)  .. (191.47bp,107.09bp);
    % Edge: s2 -> 1
    \draw [] (80.281bp,36.791bp) .. controls (77.427bp,23.663bp) and (72.8bp,2.3815bp)  .. (72.514bp,1.0642bp);
    % Edge: s2 -> 2
    \draw [] (84.497bp,36.791bp) .. controls (87.066bp,23.663bp) and (91.23bp,2.3815bp)  .. (91.487bp,1.0642bp);
    \draw (87.647bp,20.692bp) node {\Large$\bullet$};
    % Node: f_E
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (145.0bp,291.0bp) -- (102.0bp,291.0bp) -- (102.0bp,269.0bp) -- (145.0bp,269.0bp) -- cycle;
    \draw (123.5bp,280.0bp) node {$f$};
  \end{scope}
    % Node: p0
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (123.5bp,222.0bp) ellipse (11.0bp and 11.0bp);
    \draw (123.5bp,222.0bp) node {$p$};
  \end{scope}
    % Node: f_p
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (196.0bp,233.0bp) -- (153.0bp,233.0bp) -- (153.0bp,211.0bp) -- (196.0bp,211.0bp) -- cycle;
    \draw (174.5bp,222.0bp) node {$f_{p}$};
  \end{scope}
    % Node: q1
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (174.5bp,164.0bp) ellipse (11.0bp and 11.0bp);
    \draw (174.5bp,164.0bp) node {$q$};
  \end{scope}
    % Node: f_p!q
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (94.0bp,117.0bp) -- (51.0bp,117.0bp) -- (51.0bp,95.0bp) -- (94.0bp,95.0bp) -- cycle;
    \draw (72.5bp,106.0bp) node {$f_{p\lnot q}$};
  \end{scope}
    % Node: s2
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (82.5bp,48.0bp) ellipse (11.0bp and 11.0bp);
    \draw (82.5bp,48.0bp) node {$s$};
  \end{scope}
    % Node: f_!p
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (94.0bp,233.0bp) -- (51.0bp,233.0bp) -- (51.0bp,211.0bp) -- (94.0bp,211.0bp) -- cycle;
    \draw (72.5bp,222.0bp) node {$f_{\lnot p}$};
  \end{scope}
    % Node: q3
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (72.5bp,164.0bp) ellipse (11.0bp and 11.0bp);
    \draw (72.5bp,164.0bp) node {$q$};
  \end{scope}
    % Node: f_!pq
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (145.0bp,175.0bp) -- (102.0bp,175.0bp) -- (102.0bp,153.0bp) -- (145.0bp,153.0bp) -- cycle;
    \draw (123.5bp,164.0bp) node {$f_{\lnot pq}$};
  \end{scope}
    % Node: r4
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (123.5bp,106.0bp) ellipse (11.0bp and 11.0bp);
    \draw (123.5bp,106.0bp) node {$r$};
  \end{scope}
    % Node: f_!p!q
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (43.0bp,175.0bp) -- (0.0bp,175.0bp) -- (0.0bp,153.0bp) -- (43.0bp,153.0bp) -- cycle;
    \draw (21.5bp,164.0bp) node {$f_{\lnot p\lnot q}$};
  \end{scope}
    % Node: r5
  \begin{scope}
    \definecolor{strokecol}{rgb}{0.0,0.0,0.0};
    \pgfsetstrokecolor{strokecol}
    \draw (21.5bp,106.0bp) ellipse (11.0bp and 11.0bp);
    \draw (21.5bp,106.0bp) node {$r$};
  \end{scope}
  %
  \end{tikzpicture}
  
  
  }
  \end{center}