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### 1.4 Identifiers

Identifiers denote constants, types, variables, procedures and functions, units, and programs. All names of things that are defined are identifiers. An identifier consists of 255 significant characters (letters, digits and the underscore character), from which the first must be an alphanumeric character, or an underscore (__) The following diagram gives the basic syntax for identifiers.

_________________________________________________________________________________________________________ Identifiers
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