We run WW 2.13, and some problems use only `,` to indicate latex in PGML blocks, rather than [`,`]. For example,
Let `A` and `B` be subsets of a universal set `U`.
Let [`A`] and [`B`] be subsets of a universal set [`U`].
Nevertheless this displays correctly.
However we're experimenting this semester with Edfinity, and the same code does not display properly there.
Edfinity is running WW 2.14. Could the WW version be the difference? Is the first form supposed to display correctly? I was surprised that it did.