char-set:letter[variable] char-set:lower-case
[variable] char-set:upper-case
[variable] char-set:title-case
[variable] char-set:letter
[variable] char-set:digit
[variable] char-set:letter+digit
[variable] char-set:graphic
[variable] char-set:printing
[variable] char-set:whitespace
[variable] char-set:iso-control
[variable] char-set:punctuation
[variable] char-set:symbol
[variable] char-set:hex-digit
[variable] char-set:blank
[variable] char-set:ascii
[variable] char-set:empty
[variable] char-set:full
SRFI-14: predefined character sets.
Cf. Scheme48 has lower-case etc.
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