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about time a history of civilization, the history of civilization, history of civilization timeline, explanation about the history of civilization, a short history of civilization, timeline of civilizations throughout history, history of early civilization, civilization timeline of human history, civilizations timeline entire history, beginning of civilization timeline, when was the start of civilization, timeline of human civilization, timeline of ancient civilization, timeline of civilizations of the world, understanding human civilization timeline, timeline of all civilizations, when did the civilization begin, how long has civilization been around, when it comes to ancient civilization, world history civilizations timeline, when did civilization start