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\item \self Construct a ROBDD for the formula
$$f = (p \leftrightarrow q) \land (r \leftrightarrow s)$$
using \textit{variable order} $r < s < p < q$. 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.