character: Inca Builders
topic: Inca Empire Architecture
grade: 4
subject: Social Studies
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character: Machu Picchu
topic: Famous Inca Structures
grade: 4
subject: Social Studies
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character: Terrace Farmers
topic: Inca Engineering Techniques
grade: 4
subject: Social Studies
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character: Quipu
topic: Inca Communication and Organization
grade: 4
subject: Social Studies
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