Civilization may undergo a clash.Logical formLearned from65 sentences. A civilization can be universal.Logical formLearned from63 sentences. A world-city may undergo a civilization.Logical formLearned from63 sentences. A level can be constituted-of-or-filled-with civilization.Logical formLearned from63 sentences. Civilization may undergo a fall.Logical formLearned from62 sentences. A civilization can be rich.Logical formLearned from62 sentences. A civilization can be sophisticated.Logical formLearned from61 sentences. Civilizations can be indigenous.Logical formLearned from61 sentences. A civilization may undergo a fall.Logical formLearned from61 sentences. A history can be constituted-of-or-filled-with civilization.Logical formLearned from60 sentences. Civilizations may rise.Logical formLearned from60 sentences. A civilization can be democratic.Logical formLearned from60 sentences. Civilizations can be technological.Logical formLearned from59 sentences. Civilizations can be intelligent.Logical formLearned from59 sentences. The world may undergo civilizations.Logical formLearned from59 sentences.