character: Chinese Engineers
topic: Construction techniques used in the Great Wall's expansion
grade: 4
subject: Social Studies
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character: Mongolian Warriors
topic: Impact of the Great Wall on protection against invasions
grade: 4
subject: Social Studies
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character: Emperor Qin Shi Huang
topic: Initial construction of the Great Wall and its significance
grade: 4
subject: Social Studies
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character: Architects of the Ming Dynasty
topic: Innovations in Great Wall construction techniques
grade: 4
subject: Social Studies
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