character: Lily the Engineer
topic: Green Design Principles
grade: 4
subject: Reading
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character: Barney the Builder
topic: Eco-friendly Construction Techniques
grade: 4
subject: Reading
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character: Sally the Scientist
topic: Sustainability in Engineering
grade: 4
subject: Reading
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character: Tommy the Technologist
topic: Renewable Energy Sources
grade: 4
subject: Reading
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