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  ANSI Common Lisp   1 Introduction

1.7 Language Subsets

The language described in this standard contains no subsets, though subsets are not forbidden.

For a language to be considered a subset, it must have the property that any valid program in that language has equivalent semantics and will run directly (with no extralingual pre-processing, and no special compatibility packages) in any conforming implementation of the full language.

A language that conforms to this requirement shall be described as being a "subset of Common Lisp as specified by ANSI <<standard number>>."

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