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