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2.3 Identifiers and keywords

Identifiers (also referred to as names) are described by the following lexical definitions: 

identifier:     (letter|"_") (letter|digit|"_")*
letter:         lowercase | uppercase
lowercase:      "a"..."z"
uppercase:      "A"..."Z"
digit:          "0"..."9"

Identifiers are unlimited in length. Case is significant.

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