--- a/slides/slides01.tex	Wed Sep 25 23:56:36 2019 +0100
+++ b/slides/slides01.tex	Thu Sep 26 10:59:52 2019 +0100
@@ -428,7 +428,50 @@
 \end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c]
+\frametitle{Remember BF***?}
 
+\begin{center}
+\begin{tabular}{lcl}
+\bl{\texttt{>}} & $\Rightarrow$ & move one cell right\\
+\bl{\texttt{<}} & $\Rightarrow$ & move one cell left\\
+\bl{\texttt{+}} & $\Rightarrow$ & increase cell by one\\
+\bl{\texttt{-}} & $\Rightarrow$ & decrease cell by one\\
+\bl{\texttt{.}} & $\Rightarrow$ & print current cell\\
+\bl{\texttt{,}} & $\Rightarrow$ & input current cell\\
+\bl{\texttt{[}} & $\Rightarrow$ & loop begin\\
+\bl{\texttt{]}} & $\Rightarrow$ & loop end\medskip\\
+                & $\Rightarrow$ & everything else is a comment\\
+\end{tabular}  
+\end{center}  
+
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c]
+  \frametitle{A Compiler for BF***}
+  
+  \begin{center}
+  \begin{tabular}{lcl}
+  \bl{\texttt{>}} & $\Rightarrow$ & \texttt{ptr++}\\
+  \bl{\texttt{<}} & $\Rightarrow$ & \texttt{ptr--}\\
+  \bl{\texttt{+}} & $\Rightarrow$ & \texttt{(*ptr)++}\\
+  \bl{\texttt{-}} & $\Rightarrow$ & \texttt{(*ptr)--}\\
+  \bl{\texttt{.}} & $\Rightarrow$ & \texttt{putchar(*ptr)}\\
+  \bl{\texttt{,}} & $\Rightarrow$ & \texttt{*ptr = getchar()}\\
+  \bl{\texttt{[}} & $\Rightarrow$ & \texttt{while(*ptr)\{}\\
+  \bl{\texttt{]}} & $\Rightarrow$ & \texttt{\}}\medskip\\
+                  & $\Rightarrow$ & ignore everything else\\
+  \end{tabular}  
+  \end{center}\bigskip  
+  
+  \texttt{char field[30000]\\ char *ptr = &field[15000]}
+  
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
+    
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[c]
@@ -628,26 +671,26 @@
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\begin{frame}[c]
-\frametitle{Finding Operations in Scala}
-
-{\bf\code{rexp.findAllIn(string)}}\medskip
-  
-returns a list of all (sub)strings that match the 
-regular expression
-\bigskip\bigskip  
-  
-
-{\bf\code{rexp.findFirstIn(string)}}\medskip
- 
-returns either 
-
-\begin{itemize}
-\item \code{None} if no (sub)string matches or 
-\item \code{Some(s)} with the first (sub)string
-\end{itemize}
-
-\end{frame}
+%\begin{frame}[c]
+%\frametitle{Finding Operations in Scala}
+%
+%{\bf\code{rexp.findAllIn(string)}}\medskip
+%  
+%returns a list of all (sub)strings that match the 
+%regular expression
+%\bigskip\bigskip  
+%  
+%
+%{\bf\code{rexp.findFirstIn(string)}}\medskip
+% 
+%returns either 
+%
+%\begin{itemize}
+%\item \code{None} if no (sub)string matches or 
+%\item \code{Some(s)} with the first (sub)string
+%\end{itemize}
+%
+%\end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%