>It's a list given to us by Unicode/ISO they were working under a (self
>imposed, I believe) constraint that everything had to fit within a
>single 1024 block.
What characters are included in a set? If it is a-zA-Z0-9 plus undotted ij,
one set has 64 characters, giving room for 1024/64 = 16 sets.
There were only 13 sets listed, giving room for additional 3. For example,
Calligraphic
Bold Calligraphic
plus one. (Or if Bold Fraktur is removed, plus two.)