> What characters are included in a set?
you could look at the tables:-)

>  If it is a-zA-Z0-9 plus undotted ij,
> one set has 64 characters, giving room for 1024/64 = 16 sets.

It varies from set to set. the basic collections are

letters (a-z A-Z)
greek (including variant greek forms)

some of the alphabets don't have greek some don't have grrek or letters.


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