Yes, the group lists DO match the functions defined

By the way, I've just checked, and the functions listed in 2.1 _do_ match
the set of functions defined in the rest of the document.

In section 2.1, we define three groups (Small, Medium, Large), with a list
of functions assigned to each; we also identify the functions that are
not assigned to any group.

If you take the functions listed, merge them, and sort them using:
   tr -s '; ' '\n' < function-groups.txt | sort 
You get EXACTLY the same list as when you simply examine the
sorted list of functions defined by the spec (via the table of contents).
That's a good thing, and a useful consistency check.
 
--- David A. Wheeler