CLHS: Section 13.1.4.3

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## 13.1.4.3 Characters With Case

The characters with case are a subset of the alphabetic[1] 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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