/usr/lib/s9fes/help/char-cieqp is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | R4RS 6.6 (char-ci=? char1 char2) ==> boolean
(char-ci<? char1 char2) ==> boolean
(char-ci>? char1 char2) ==> boolean
(char-ci<=? char1 char2) ==> boolean
(char-ci>=? char1 char2) ==> boolean
These procedures are similar to CHAR=? et cetera, but they treat
upper case and lower case letters as the same. For example,
(char-ci=? #\A #\a) ==> #t.
Some implementations may generalize these procedures to take more
than two arguments, as with the corresponding numerical predicates.
The S9fES versions of these procedures do accept more than two
arguments.
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