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An identifier is a sequence of 1 to 256 characters from the set of letters, digits, and break characters,
beginning with a letter. Case is significant. The following words are reserved and cannot be used as identifiers: | ||||||||||||||||||||||||||||||
The following are valid identifiers: B n3 X_5 a@1 This_is_a_valid_identifier The following are not valid identifiers: 1A 99# _._ b b X.Y |