- the 26 uppercase letters of the English alphabet
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
- the 26 lowercase letters of the English alphabet
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
- the 10 decimal digits
0 1 2 3 4 5 6 7 8 9
- the 29 graphic characters
! " # % & ' ( ) * + , - . / :
; < = > ? [ \ ] ^ { | } ~ _
- the space character, and control characters representing
horizontal tab, vertical tab, and form feed.
In addition, the execution character set must contain