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Identifiers

Identifiers are names used for user-defined variables and functions.
They can be composed of:

upper (A-Z) or lower (a-z) case letters,

underscore (_),

digits (0-9).

An identifier cannot begin with a digit. Identifiers are case-sensitive.
Here are some examples of valid identifiers:

myVar
_myVar
my123Var
MAX_LEN
max_len