4 

     4 

     5 \begin{document}

     5 \begin{document}

     6 

     6 

     7 \section*{Homework 7}

     7 \section*{Homework 7}

     8 

     8 

    10 

    10 

    11 \begin{enumerate}

    11 \begin{enumerate}

    12 \item Suppose the context-sensitive grammar

    12 \item Suppose the context-sensitive grammar

    13 

    13 

    14 \begin{center}

    14 \begin{center}