A period may undergo a civilization.Logical formLearned from8 sentences. A degree may pertain-to a civilization.Logical formLearned from8 sentences. A hallmark can be constituted-of-or-filled-with civilization.Logical formLearned from8 sentences. Civilization may undergo an establishment.Logical formLearned from8 sentences. Heirs can be to a civilization.Logical formLearned from8 sentences. Inhabitants may pertain-to a civilization.Logical formLearned from8 sentences. Clashes can be between civilizations.Logical formLearned from8 sentences. A contact can be with civilization.Logical formLearned from8 sentences. A civilization can be rational.Logical formLearned from8 sentences. An advance can be in civilization.Logical formLearned from8 sentences. A series can be constituted-of-or-filled-with civilizations.Logical formLearned from8 sentences. An element can be constituted-of-or-filled-with civilization.Logical formLearned from8 sentences. A civilization can be polite.Logical formLearned from8 sentences. Civilization can be in decline.Logical formLearned from8 sentences. A civilization can be unconscious.Logical formLearned from8 sentences.