Ancients may undergo a civilization.Logical formLearned from5 sentences. Civilizations may evolve.Logical formLearned from5 sentences. Civilizations can be on a planet.Logical formLearned from5 sentences. Problems may pertain-to civilization.Logical formLearned from5 sentences. A civilization of a country may date from an era.Logical formLearned from5 sentences. A world-city can be a civilization.Logical formLearned from5 sentences. Ways may pertain-to a civilization.Logical formLearned from5 sentences. A professor can be constituted-of-or-filled-with civilization.Logical formLearned from5 sentences. A threat can be to civilizations.Logical formLearned from5 sentences. A result can be constituted-of-or-filled-with civilization.Logical formLearned from5 sentences. A transition can be from civilization.Logical formLearned from5 sentences. Elements may pertain-to a civilization.Logical formLearned from5 sentences. An isolation can be from civilization.Logical formLearned from5 sentences. First civilizations may undergo a rise.Logical formLearned from5 sentences. Relations can be between civilizations.Logical formLearned from5 sentences.