character: Dr. Patel
topic: Advanced Water Purification Techniques
grade: 11
subject: Chemistry
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character: Professor Smith
topic: Water Quality and Treatment Methods
grade: 11
subject: Chemistry
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character: Ms. Johnson
topic: Environmental Chemistry: Water Contamination Solutions
grade: 11
subject: Chemistry
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character: Mr. Lee
topic: Innovative Filtration Systems for Clean Water
grade: 11
subject: Chemistry
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