(a) upper_case_letter
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
(b) digit
0 1 2 3 4 5 6 7 8 9
(c) special_character
" # & ' () * + , - . / : ; < = > _ |
(d) space_character
(e) lower_case_letter
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
(f) other_special_character
! $ % @ ? [ \ ] ^ ` {} ~
(g) Format effectors ( format_effectors ) are