character: Dr. Lee
topic: Hydraulic Systems in Building Design
grade: 9
subject: Physics
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character: Professor Green
topic: Principles of Fluid Dynamics
grade: 9
subject: Physics
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character: Engineer Smith
topic: Water Supply Systems in Urban Planning
grade: 9
subject: Physics
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character: Architect Johnson
topic: Sustainable Building Design Practices
grade: 9
subject: Physics
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