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\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}