--- a/hws/hw01.tex	Tue Aug 23 12:26:13 2016 +0200
+++ b/hws/hw01.tex	Tue Aug 23 15:38:20 2016 +0200
@@ -67,6 +67,8 @@
       obviously match the same strings, namely $[a]$ and
       $[b]$.
 
+\item What is meant by the notions \emph{evil regular expressions}
+      and \emph{catastrophic backtracking}? 
 
 \item \POSTSCRIPT  
 \end{enumerate}