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| ANSI Common Lisp 13 Characters 13.1 Character Concepts 13.1.4 Character Categories ### 13.1.4.6 Digits in a Radix What qualifies as a digit depends on the radix (an integer between `2` and `36`, inclusive). The potential digits are: `0 1 2 3 4 5 6 7 8 9 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` Their respective weights are `0`, `1`, `2`, ... `35`. In any given radix n, only the first n potential digits are considered to be digits. For example, the digits in radix `2` are `0` and `1`, the digits in radix `10` are `0` through `9`, and the digits in radix `16` are `0` through `F`. Case is not significant in digits; for example, in radix `16`, both `F` and `f` are digits with weight `15`.

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