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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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