An identifier
is a name -- it can be a variable name, a macro name
or an array name.
An
identifier may begin with the letters
a-z, A-Z or
_ (underscore).
The remaining letters in a name may be those characters
or the digits
0-9. There is no limit to the number of characters in a variable name.
In the syntax rules described later, such names are represented by
the term
identifier.
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