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ANSI Common Lisp  13 Characters 13.1 Character Concepts 13.1.4 Character Categories
13.1.4.3 Characters With Case
The characters with case are
a subset of the alphabetic1 characters.
A character with case has the property of being either
uppercase or lowercase.
Every character with case is in one-to-one correspondence
with some other character with the opposite case.
13.1.4.3.1 Uppercase Characters
13.1.4.3.2 Lowercase Characters
13.1.4.3.3 Corresponding Characters in the Other Case
13.1.4.3.4 Case of Implementation-Defined Characters
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