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From: "Richard M. Stallman" <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: Documentation for car and cdr
Date: Thu, 26 Jan 2006 12:46:35 -0500
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    Return the car of cons cell CONS.  If arg is nil, return nil.
    Error if arg is not nil and not a cons cell.  See also `car-safe'.

How about this:

    Return the car of cons cell (or list) CONS.  If arg is nil, return nil.
    Error if arg is not nil and not a cons cell.  See also `car-safe'.