(Classification systems) may undergo a development.Logical formLearned from20 sentences. A classification can be environmental.Logical formLearned from20 sentences. Roads may undergo a classification.Logical formLearned from20 sentences. A classification may pertain-to a world-city.Logical formLearned from20 sentences. Classification may match.Logical formLearned from20 sentences. Some classifications may be considered.Logical formLearned from19 sentences. A (rider classification) may pertain-to a person.Logical formLearned from19 sentences. Classification may be used.Logical formLearned from19 sentences. Dialects may undergo a classification.Logical formLearned from19 sentences. Demons may undergo a classification.Logical formLearned from19 sentences. Classification can be in a country.Logical formLearned from19 sentences. Issues can be constituted-of-or-filled-with classification.Logical formLearned from19 sentences. Bacteria may undergo a classification.Logical formLearned from19 sentences. A stellar classification may pertain-to a star.Logical formLearned from19 sentences. A nature may pertain-to a classification.Logical formLearned from19 sentences.