--- a/slides/slides04.tex	Fri Nov 25 00:03:15 2022 +0000
+++ b/slides/slides04.tex	Fri Dec 02 07:48:03 2022 +0000
@@ -1,8 +1,8 @@
 % !TEX program = xelatex
-\documentclass[dvipsnames,14pt,t,xelatex]{beamer}
-\usepackage{../slides}
-\usepackage{../graphics}
-\usepackage{../langs}
+\documentclass[dvipsnames,14pt,t,xelatex,aspectratio=169,xcolor={table}]{beamer}
+\usepackage{../styles/slides}
+\usepackage{../styles/mygraphs}
+\usepackage{../styles/langs}
 %%\usepackage{../data}
 \usepackage[export]{adjustbox}
 \usetikzlibrary{shapes}
@@ -177,10 +177,11 @@
     Email:  & christian.urban at kcl.ac.uk\\
     %Office: & N\liningnums{7.07} (North Wing, Bush House)\bigskip\\
     Slides \& Code: & KEATS\bigskip\\
-    %Office Hours: &  Thursdays 12:00 -- 14:00\\
-    %Additionally: & (for Scala) Tuesdays 10:45 -- 11:45\\
-    \multicolumn{2}{c}{\Large\textbf{https://pollev.com/cfltutoratki576}}\\[2cm]
-    \textcolor{red}{Scala Install Clinic:} & \textcolor{red}{This evening at 17:00 (online)}\\
+
+    Office Hour: &  Fridays 11:00 -- 12:00\\
+    Location: & N7.07 (North Wing, Bush House)\bigskip\\
+
+    Pollev: & \texttt{\alert{https://pollev.com/cfltutoratki576}}\\  \\
   \end{tabular}
   \end{center}
 
@@ -188,30 +189,30 @@
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\begin{frame}[c]
-\frametitle{Hints in CW}
-
-\begin{center}  
-\includegraphics[scale=0.4]{../pics/hints.png}
-\end{center}
-
-\small
-\begin{itemize}
-  \item Scala Library, e.g.~\texttt{span} in \\
-  \url{https://www.scala-lang.org/api/current/scala/collection/immutable/List.html}
-\end{itemize}
-\end{frame}
+%\begin{frame}[c]
+%\frametitle{Hints in CW}
+%
+%\begin{center}  
+%\includegraphics[scale=0.4]{../pics/hints.png}
+%\end{center}
+%
+%\small
+%\begin{itemize}
+%  \item Scala Library, e.g.~\texttt{span} in \\
+%  \url{https://www.scala-lang.org/api/current/scala/collection/immutable/List.html}
+%\end{itemize}
+%\end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\begin{frame}[c]
-\frametitle{Discussion Forum}
+%\begin{frame}[c]
+%\frametitle{Discussion Forum}
 
-\begin{center}  
-\includegraphics[scale=0.38]{/Users/cu/discussion.png}
-\end{center}
+%\begin{center}  
+%\includegraphics[scale=0.38]{/Users/cu/discussion.png}
+%\end{center}
 
-\end{frame}
+%\end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
@@ -333,6 +334,26 @@
 \end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c,fragile]
+\frametitle{Last Week: Pattern Matching} 
+\small
+
+\begin{lstlisting}[language=Scala, numbers=none, xleftmargin=3mm]
+def mkeps(r: Rexp) : Val = r match {
+  case ONE => Empty
+  case ALT(r1, r2) => ...
+  case SEQ(r1, r2) => ...
+  case STAR(r) => ...
+  case RECD(x, r1) => Rec(x, mkeps(r))
+  ...
+}
+\end{lstlisting}
+
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
+
+
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%     
 \begin{frame}[c,fragile]
 \frametitle{Reverse Polish Notation}