For section 4, I know you do not claim to be exhaustive,
but it might be worth adding the most commonly used
missing case: variables :)

> On May 26, 2020, at 21:51, Steve Downey via SG16 <sg16_at_[hidden]> wrote:
>
> Find attached a draft of the UAX31 paper for discussion.
> Viewable at http://htmlpreview.github.io/?https://github.com/steve-downey/papers/blob/master/generated/p1949.html <http://htmlpreview.github.io/?https://github.com/steve-downey/papers/blob/master/generated/p1949.html>
> Source at https://github.com/steve-downey/papers/blob/master/p1949.md <https://github.com/steve-downey/papers/blob/master/p1949.md>
>
> (note that github doesn't format the same way that mpark's WG21 format does)
> <p1949.html>--
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