character: Li Wei
topic: Great Wall Construction Techniques
grade: 3
subject: History
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character: Zhang Fang
topic: Workers' Roles in Building the Great Wall
grade: 3
subject: History
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character: Wang Jun
topic: Materials Used in the Great Wall
grade: 3
subject: History
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character: Chen Mei
topic: The Importance of the Great Wall to China
grade: 3
subject: History
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