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Alphabet/Ace a.  a:  

a. is a list of the elements of the alphabet; it determines the collating sequence used in grading and sorting (/: and \:). The content of a. as well as the ordering of its elements may differ on different computing systems.

The number of elements in the alphabet is given by $a., and a 32-column display is given by an expression such as 8 32$a. . The inclusion of certain control characters (such as the carriage return) and non-printing characters make such a display difficult to decipher, but the major alphabet is usually given by:

   1 2 3 { 8 32 $ a.
 !"#$%&'()*+,-./0123456789:;<=>?
@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_
`abcdefghijklmnopqrstuvwxyz{|}~
The index of the carriage return is commonly 13 (as may be tested by entering 13{a.), and the indices of the space and other characters may be determined as illustrated below:
   a. i. 'aA +-*%'
97 65 32 43 45 42 37
The ace (a unit, from Latin as) is denoted by a: . It is the boxed empty list <$0 .
 




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