char-set-adjoin[procedure] char-set-adjoin cset char1 ...
[procedure] char-set-adjoin! cset char1 ...
SRFI-14: Returns a character set that contains all characters
in cset and characters given as char1 ....
char-set-adjoin always creates a new character set.
char-set-adjoin! may modify cset.
See also char-set-delete, char-set-delete!.
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