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\item \self Construct a Reduced Ordered Binary Decision Diagram (ROBDD) for the formula
$$f = (q \land \lnot s) \lor (s \land (\neg r \vee p)) \lor (p \land q \land r)$$
using \textit{variable order} $p < q < r < s$. Use complemented edges and a node for \texttt{true} as the only constant node. To simplify drawing, you may assume that \textit{dangling edges} point to the constant node. Write down all cofactors that you compute to obtain the final result and mark them in the graph.
% (q and not s) or (s and (not r or p)) or (p and q and r)
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