\item \self Tick all properties that apply to a reduced and ordered BDD.
\begin{itemize}
  \item[$\square$] If the \textit{else}-edge of a node is complemented, it may point to the same child node as the \textit{then}-edge.
  \item[$\square$] Using the reduced and ordered BDD representation of formula $f$, it is possible to whether $f$ is valid in constant time.
  \item[$\square$] The size of a BDD is independent on the variable order.
  \item[$\square$] Using complemented edges, negation can be performed in constant time.
  \item[$\square$] The size of a BDD is independent of the variable order.
\end{itemize}