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| ANSI Common Lisp 24 System Construction 24.1 System Construction Concepts ### 24.1.2 Features A feature is an aspect or attribute of Common Lisp, of the implementation, or of the environment. A feature is identified by a symbol. A feature is said to be present in a Lisp image if and only if the symbol naming it is an element of the list held by the variable *features*, which is called the features list. 24.1.2.1 Feature Expressions

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