(m4.info) Syntax

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 Lexical and syntactic conventions
 *********************************
 
    As `m4' reads its input, it separates it into "tokens".  A token is
 either a name, a quoted string, or any single character, that is not a
 part of either a name or a string.  Input to `m4' can also contain
 comments.
 

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* Names                       Macro names
* Quoted strings              Quoting input to m4
* Other tokens                Other kinds of input tokens
* Comments                    Comments in m4 input
 

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