Identities may be kept confidential.Logical formLearned from19 sentences. A source can be confidential.Logical formLearned from19 sentences. Identities may remain confidential.Logical formLearned from19 sentences. Tests can be confidential.Logical formLearned from19 sentences. A ballot can be confidential.Logical formLearned from19 sentences. Details may remain confidential.Logical formLearned from19 sentences. (Government records) can be confidential.Logical formLearned from19 sentences. Mail can be confidential.Logical formLearned from18 sentences. A (disclosure system) can be confidential.Logical formLearned from18 sentences. An account can be confidential.Logical formLearned from18 sentences. Personal information may be kept confidential.Logical formLearned from18 sentences. (Tax shelters) can be confidential.Logical formLearned from18 sentences. A communication can be confidential.Logical formLearned from18 sentences. A person may disclose confidential information.Logical formLearned from18 sentences. A password can be confidential.Logical formLearned from18 sentences.