Early civilizations may think.Logical formLearned from7 sentences. A decline can be in civilization.Logical formLearned from7 sentences. A civilization can be on earth.Logical formLearned from7 sentences. A civilization may destroy itself.Logical formLearned from7 sentences. A person may find civilization.Logical formLearned from7 sentences. A symbol may pertain-to a civilization.Logical formLearned from7 sentences. A civilization can be on a planet.Logical formLearned from7 sentences. Civilization may undergo requirements.Logical formLearned from7 sentences. Traditions may pertain-to civilizations.Logical formLearned from7 sentences. A portal can be for a civilization.Logical formLearned from7 sentences. Civilization may undergo rudiments.Logical formLearned from7 sentences. Civilizations may undergo a meeting.Logical formLearned from7 sentences. The future of human civilization may depend on give_upping fossil fuels.Logical formLearned from7 sentences. A hope can be for a civilization.Logical formLearned from7 sentences. A civilization can be negligent.Logical formLearned from7 sentences.