char<?[procedure] char=? char1 char2
[procedure] char<=? char1 char2
[procedure] char<? char1 char2
[procedure] char>=? char1 char2
[procedure] char>? char1 char2
R5RS: Compare two chracters.
[procedure] char=? char1 char2 char3 ...
[procedure] char<=? char1 char2 char3 ...
[procedure] char<? char1 char2 char3 ...
[procedure] char>=? char1 char2 char3 ...
[procedure] char>? char1 char2 char3 ...
R6RS, MzScheme: Compare two or more characters.
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