Multiple Escape Characters (ANSI and GNU Common Lisp Document)

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#### 2.1.4.5 Multiple Escape Characters

A pair of multiple escape characters is used to indicate that an enclosed sequence of characters, including possible macro characters and whitespace_2 characters, are to be treated as alphabetic_2 characters with case preserved. Any single escape and multiple escape characters that are to appear in the sequence must be preceded by a single escape character.

Vertical-bar is a multiple escape character in standard syntax.