--- a/hws/hw07.tex	Sat Dec 19 21:11:23 2015 +0000
+++ b/hws/hw07.tex	Thu Dec 31 23:40:48 2015 +0000
@@ -67,7 +67,9 @@
 $S \rightarrow \texttt{begin} \cdot B\cdot \texttt{end}$\\
 $B \rightarrow S\cdot \texttt{;}$\\
 $B \rightarrow S\cdot \texttt{;} \cdot B$\\
-$E \rightarrow num$
+$S \rightarrow num$\\
+$E \rightarrow num$\\
+$B \rightarrow num$
 \end{tabular}
 \end{center}