character: Emperor Qin
topic: The significance of the Great Wall in ancient China
grade: 4
subject: Social Studies
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character: The Great Wall
topic: Protection against invasions
grade: 4
subject: Social Studies
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character: Emperor Qin
topic: Unification of China
grade: 4
subject: Social Studies
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character: Ancient China
topic: Cultural impact of the Great Wall
grade: 4
subject: Social Studies
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