\item \self Construct a reduced ordered binary decision diagram (ROBDD) for the formula

$$f = (p \oplus q) \land \lnot r$$

using \textit{variable order} $p < q < r$. 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.