64       think of instances where two regular expressions match

    64       think of instances where two regular expressions match

    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       $[b]$.

    70 \end{enumerate}

    72 \end{enumerate}

    71 

    73 

    72 \end{document}

    74 \end{document}

    73 

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