65       the same strings, but it is not so obvious that they do?

    65       the same strings, but it is not so obvious that they do?

    66       For example $a + b$ and $b + a$ do not count\ldots they

    66       For example $a + b$ and $b + a$ do not count\ldots they

    67       obviously match the same strings, namely $[a]$ and

    67       obviously match the same strings, namely $[a]$ and

    68       $[b]$.

    68       $[b]$.

    69 

    69 

    70 

    72 

    71 \item \POSTSCRIPT  

    73 \item \POSTSCRIPT  

    72 \end{enumerate}

    74 \end{enumerate}

    73 

    75 

    74 \end{document}

    76 \end{document}