\item \self Look at the following statements and tick them if they are true.

\begin{itemize}
\item[$\square$] You need an assumption box, if you want to eliminate an implication.
\item[$\square$] You need an assumption box, if you want to introduce a negation.
\item[$\square$] You need an assumption box, if you want to use the Modus Tollens.
\item[$\square$] You need an assumption box, if you want to use the Law of the Excluded Middle

\end{itemize}
