--- a/slides06.tex	Thu Nov 01 10:04:30 2012 +0000
+++ b/slides06.tex	Thu Nov 01 20:00:47 2012 +0000
@@ -548,7 +548,7 @@
 $P$ & $\rightarrow$ &  $V\cdot N$ \\
 $N$ & $\rightarrow$ &  $N\cdot N$ \\
 $N$ & $\rightarrow$ &  $\texttt{students} \;|\; \texttt{Jeff} \;|\; \texttt{geometry} \;|\; \texttt{trains} $ \\
-$E$ & $\rightarrow$ &  $\texttt{trains}$ 
+$V$ & $\rightarrow$ &  $\texttt{trains}$ 
 \end{tabular}}
 \end{center}