A region may undergo a civilization.Logical formLearned from15 sentences. A phase can be constituted-of-or-filled-with civilization.Logical formLearned from15 sentences. Civilization may undergo a formation.Logical formLearned from15 sentences. A civilization can be international.Logical formLearned from15 sentences. Civilizations may collide.Logical formLearned from15 sentences. Some semblance can be constituted-of-or-filled-with civilization.Logical formLearned from15 sentences. A heartbeat can be constituted-of-or-filled-with civilization.Logical formLearned from15 sentences. Cities may be built during a (valley civilization).Logical formLearned from15 sentences. A civilization may undergo a disappearance.Logical formLearned from15 sentences. Civilizations can be from a beginning of a history.Logical formLearned from15 sentences. A version can be constituted-of-or-filled-with civilization.Logical formLearned from15 sentences. A threat may pertain-to civilization.Logical formLearned from15 sentences. Civilization may be founded.Logical formLearned from15 sentences. A civilization may be based.Logical formLearned from15 sentences. A ceremony may showcase an ancient civilization.Logical formLearned from15 sentences.