Add "You should be able to answer these questions" section

VL1.tex

@@ -672,6 +672,28 @@ For haskell IDEs, see \url{https://wiki.haskell.org/IDEs}
 \end{itemize}
 \end{frame}
 
+\begin{frame}[fragile]
+\frametitle{You should be able to answer these questions}
+\begin{itemize}
+\item What are side effects?
+\item What is referential transparency?
+\item Can you have referential transparency with side effects?
+\item What does the output of a haskell function depend on?
+\item What is laziness?
+\item When are types checked in haskell?
+\end{itemize}
+\vspace{\baselineskip}
+Does this compile? If not, fix it. Is this a total function?
+\setHaskellCodeStyle
+\begin{lstlisting}
+data FakeInt = MkDouble Double
+             | MkInt Int
+
+f :: Int -> FakeInt
+f 0 = 0.5
+\end{lstlisting}
+\end{frame}
+
 \begin{frame}
 \frametitle{Sources}
 \begin{itemize}