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--- a/hws/hw01.tex	Fri Sep 25 08:51:12 2015 +0100
+++ b/hws/hw01.tex	Fri Sep 25 17:39:02 2015 +0100
@@ -5,6 +5,8 @@
 
 \section*{Homework 1}
 
+\HEADER
+
 \begin{enumerate}
 
 \item {\bf (Optional)} If you want to run the code presented in the
@@ -44,7 +46,7 @@
 
 \item Let $A = \{[a], [b], [c], [d]\}$. How many strings are in $A^4$?
   Consider the case of $A^4$ where one of the strings in $A$ is the 
-  empty string.
+  empty string, for example $A = \{[a], [b], [c], []\}$.
 
 \item How many regular expressions are there to match the string
   $abc$? How many if they cannot include $\epsilon$ and $\varnothing$?

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--- a/slides/slides01.tex	Fri Sep 25 08:51:12 2015 +0100
+++ b/slides/slides01.tex	Fri Sep 25 17:39:02 2015 +0100
@@ -245,7 +245,7 @@
 
 transforming strings into structured data\\[10mm]
 
-\alert<2>{\LARGE\bf Lexing} \onslide<2>{\hfill{}baseed on regular expressions}\medskip\\
+\alert<2>{\LARGE\bf Lexing} \onslide<2>{\hfill{}based on regular expressions}\medskip\\
 \hspace{5mm}(recognising ``words'')\\[6mm]
 
 {\LARGE\bf Parsing}\medskip\\

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--- a/style.sty	Fri Sep 25 08:51:12 2015 +0100
+++ b/style.sty	Fri Sep 25 17:39:02 2015 +0100
@@ -41,3 +41,7 @@
 \newcommand{\dq}[1]{\mbox{\tt{"}}#1\mbox{\tt{"}}}
 
 \definecolor{codegray}{gray}{0.9}
+
+\newcommand{\HEADER}{{\bf Please submit your solutions via email. Please submit 
+only ASCII text or PDFs. Every solution should be preceeded by the corresponding 
+question. Solutions will only be accepted until 30th December!}\bigskip}