Elements may undergo a classification.Logical formLearned from25 sentences. A classification can be uncertain.Logical formLearned from25 sentences. Birds may undergo a classification.Logical formLearned from25 sentences. A patent may undergo a classification.Logical formLearned from25 sentences. A classification can be protected.Logical formLearned from25 sentences. Substances may undergo a classification.Logical formLearned from25 sentences. A view may show classification.Logical formLearned from25 sentences. A classification may change.Logical formLearned from25 sentences. Crimes may undergo a classification.Logical formLearned from25 sentences. Employees may undergo a classification.Logical formLearned from25 sentences. Minerals may undergo a classification.Logical formLearned from25 sentences. A (classification system) may pertain-to a person.Logical formLearned from25 sentences. A classification may undergo a revision.Logical formLearned from25 sentences. Children may undergo a classification.Logical formLearned from25 sentences. Tumors may undergo a classification.Logical formLearned from25 sentences.