A meaning may pertain-to an identifier.Logical formLearned from8 sentences. An unique identifier can be universal.Logical formLearned from8 sentences. (Student identifiers) can be statewide.Logical formLearned from8 sentences. An identifier may be defined.Logical formLearned from8 sentences. Identifiers may pertain-to persons.Logical formLearned from8 sentences. An unique identifier can be permanent.Logical formLearned from8 sentences. An (object identifier) can be persistent.Logical formLearned from8 sentences. Packets can be with an identifier.Logical formLearned from8 sentences. A (source identifier) can be intact.Logical formLearned from8 sentences. Packets may contain an identifier.Logical formLearned from8 sentences. An identifier can be reliable.Logical formLearned from8 sentences. Identifiers can be standardized.Logical formLearned from8 sentences. A reference can be to an identifier.Logical formLearned from8 sentences. A (residue name) may be followed by a (residue number and/or chain identifier).Logical formLearned from8 sentences. An identifier can be useful.Logical formLearned from8 sentences.