character: Watchtowers
topic: Architectural features of the Great Wall used for defense
grade: 6
subject: Social Studies
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character: Battlements
topic: Defensive structures of the Great Wall
grade: 6
subject: Social Studies
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character: Parapets
topic: Protection features of the Great Wall
grade: 6
subject: Social Studies
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character: Signal Fires
topic: Communication methods at the Great Wall
grade: 6
subject: Social Studies
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