Implementation-Defined Packages (ANSI and GNU Common Lisp Document)

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#### 11.1.2.9 Implementation-Defined Packages

Other, implementation-defined packages might be present in the initial Common Lisp environment.

It is recommended, but not required, that the documentation for a conforming implementation contain a full list of all package names initially present in that implementation but not specified in this specification. (See also the function list-all-packages.)