--- a/slides/slides01.tex	Tue Sep 15 23:13:45 2020 +0100
+++ b/slides/slides01.tex	Fri Sep 18 00:33:03 2020 +0100
@@ -369,7 +369,7 @@
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[c]
-  \frametitle{A ``Compiler'' for BF*** to C}
+  \frametitle{Another~``Compiler''~for~BF~to~C}
   
   \begin{center}
   \begin{tabular}{rcl}
@@ -389,26 +389,7 @@
   
 \end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
-
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\begin{frame}[c]
-  \frametitle{Recap}
-  
-  \begin{itemize}
-  \item interpreter \bl{\texttt{bfi.sc}} \\$\Rightarrow$ 11 mins\pause
-  \item simple compiler \bl{\texttt{bfi0.sc}}, no optimisations  \\$\Rightarrow$ 20 secs\pause
-  \item ``advanced'' compiler \bl{\texttt{bfi1.sc}}, no optimisations  \\$\Rightarrow$ 5 secs\bigskip\pause
-
-  \item simple compiler \bl{\texttt{bfi0.sc}},
-    \alert{\textbf{full optimisations}}  \\$\Rightarrow$ 7 secs  
-  \end{itemize}\bigskip\pause
-
-  \hspace{4cm}all programs on KEATS
-  
-\end{frame}
-%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  
-
-
+    
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[t]
 \frametitle{A Brief Compiler History}
@@ -439,6 +420,73 @@
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[c]
+\frametitle{Some Housekeeping}
+
+\textbf{Exams will be online:}\bigskip
+
+\begin{itemize}
+\item final exam in January (30\%)
+\item mid-term shortly after Reading Week (10\%)\bigskip
+  
+\item weekly engagement (10\%)  
+\end{itemize}\bigskip\bigskip\pause
+
+
+\textbf{Weekly Homework (optional):}
+\begin{itemize}
+\item uploaded on KEATS, send answers via email, responded individually
+\item \alert{\bf all} questions in the exam and mid-term will be from the HW!!
+\end{itemize}  
+
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c]
+\frametitle{Some Housekeeping}
+
+\textbf{Coursework (5 accounting for 45\%):}\bigskip
+
+\begin{itemize}
+\item matcher (5\%)
+\item lexer (8\%)
+\item parser / interpreter (10\%)
+\item JVM compiler (10\%)
+\item LLVM compiler (12\%) 
+\end{itemize}\bigskip\pause
+
+you can use any programming language you like (Haskell, Rust)\\\pause
+you can use any code I showed you and uploaded to KEATS\ldots\textbf{BUT NOTHING ELSE!}\pause
+
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
+
+
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c]
+\frametitle{Lectures 1 - 5}
+
+transforming strings into structured data\\[10mm]
+
+{\LARGE\bf Lexing} {\hfill{}based on regular expressions}\medskip\\
+\hspace{5mm}(recognising ``words'')\\[6mm]
+
+{\LARGE\bf Parsing}\medskip\\
+\hspace{5mm}(recognising ``sentences'')
+
+\begin{textblock}{1}(10,9.1)
+\begin{tabular}{c}
+\includegraphics[scale=0.1]{../pics/rosetta.jpg}\\[-2mm]
+\footnotesize Stone of Rosetta
+\end{tabular}
+\end{textblock}
+
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c]
 \frametitle{Lectures 1 - 5}
 
 transforming strings into structured data\\[10mm]
@@ -479,13 +527,13 @@
   \end{textblock}
   
   \end{frame}
-  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
   
 
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[t]
-\frametitle{Familiar Regular Expr.}
+\frametitle{Familiar Regular Expresssions}
 \small
 \begin{center}
 \texttt{[a-z0-9\_$\backslash{}$.-]+ @ [a-z0-9$\backslash{}$.-]+ . [a-z$\backslash{}$.]\{2,6\}}
@@ -509,11 +557,35 @@
 \end{tabular}
 \end{center}
 
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c]
+\frametitle{Some ``innocent'' examples}
+
+Let's try two examples
+
+\begin{center}
+  \bl{\texttt{(a*)*b}}
+  \hspace{2cm}
+  \bl{\texttt{[a?]\{n\}[a]\{n\}}}
+\end{center}\bigskip\pause  
+
+and match them with strings of the form
+
+\begin{center}
+  \bl{\texttt{a}},
+  \bl{\texttt{aa}},
+  \bl{\texttt{aaa}},
+  \bl{\texttt{aaaa}},
+  \bl{\texttt{aaaaa}},
+  \bl{$\underbrace{\texttt{a}...\texttt{a}}_n$}  
+\end{center}  
 
 \end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
-
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[c]
 \frametitle{Why Bother with Regexes?}
@@ -804,26 +876,26 @@
  
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\begin{frame}[t]
-\frametitle{A Regular Expression}
-
-\begin{itemize}
-\item \ldots{} is a pattern or template for specifying strings
-\end{itemize}\bigskip
-  
-\begin{center}  
-\only<1>{\scode{"https?://[^"]*"}}%
-\only<2>{\scode{""""https?://[^"]*"""".r}}
-\end{center}\bigskip\bigskip
-
-matches for example\smallskip\\  
-\hspace{2mm}\code{"http://www.foobar.com"}\\
-\hspace{2mm}\code{"https://www.tls.org"}\smallskip\\
-
-but not\smallskip\\  
-\hspace{2mm}\code{"http://www."foo"bar.com"}\\
-
-\end{frame}
+%\begin{frame}[t]
+%\frametitle{A Regular Expression}
+%
+%\begin{itemize}
+%\item \ldots{} is a pattern or template for specifying strings
+%\end{itemize}\bigskip
+%  
+%\begin{center}  
+%\only<1>{\scode{"https?://[^"]*"}}%
+%\only<2>{\scode{""""https?://[^"]*"""".r}}
+%\end{center}\bigskip\bigskip
+%
+%matches for example\smallskip\\  
+%\hspace{2mm}\code{"http://www.foobar.com"}\\
+%\hspace{2mm}\code{"https://www.tls.org"}\smallskip\\
+%
+%but not\smallskip\\  
+%\hspace{2mm}\code{"http://www."foo"bar.com"}\\
+%
+%\end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -887,7 +959,7 @@
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{frame}[t]
-\frametitle{Regular Expressions}
+\frametitle{(Basic) Regular Expressions}
 
 Their inductive definition: