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| Allegro CL

| ANSI Common Lisp 13 Characters 13.1 Character Concepts 13.1.4 Character Categories ### 13.1.4.2 Alphabetic Characters The alphabetic1 characters are a subset of the graphic characters. Of the standard characters, only these are the alphabetic1 characters: `A B C D E F G H I J K L M N O P Q R S T U V W X Y Z` `a b c d e f g h i j k l m n o p q r s t u v w x y z` Any implementation-defined character that has case must be alphabetic1. For each implementation-defined graphic character that has no case, it is implementation-defined whether that character is alphabetic1.

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