diff -r 564f7584eff1 -r 245d302791c7 hws/hw02.tex
--- a/hws/hw02.tex	Wed Jun 01 13:04:06 2016 +0100
+++ b/hws/hw02.tex	Tue Jun 14 11:41:48 2016 +0100
@@ -100,7 +100,12 @@
 
 \item Give a regular expressions that can recognise all
       strings from the language $\{a^n\;|\;\exists k.\; n = 3 k
-      + 1 \}$. \end{enumerate}
+      + 1 \}$. 
+      
+\item Give a regular expression that can recognise an odd 
+number of $a$s or an even number of $b$s.     
+      
+\end{enumerate}
 
 \end{document}