character: Li the Builder
topic: How the Great Wall Was Constructed
grade: 3
subject: History
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character: Emperor Qin
topic: The Purpose of the Great Wall
grade: 3
subject: History
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character: Ancient Workers
topic: Building Techniques of the Great Wall
grade: 3
subject: History
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character: Traveling Merchant
topic: The Importance of the Great Wall for Trade
grade: 3
subject: History
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