3 \usepackage{../langs}

     3 \usepackage{../langs}

     4 \usepackage{../grammar}

     4 \usepackage{../grammar}

     5 \usepackage{../graphics}

     5 \usepackage{../graphics}

     6 \usepackage{amssymb}

     6 \usepackage{amssymb}

     7 

     7 

     8 

    10 

     9 \begin{document}

    11 \begin{document}

    10 \lstset{morekeywords={def,if,then,else,write,read},keywordstyle=\color{codepurple}\bfseries}

    12 \lstset{morekeywords={def,if,then,else,write,read},keywordstyle=\color{codepurple}\bfseries}

    11 

    13 

    12 

    14