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3.1 Macro names

A name is any sequence of letters, digits, and the character `_'
(underscore), where the first character is not a digit.  `m4' will use
the longest such sequence found in the input.  If a name has a macro
definition, it will be subject to macro expansion (Note: Macros).
Names are case-sensitive.

   Examples of legal names are: `foo', `_tmp', and `name01'.

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