character: Professor Mark Johnson
topic: Chemical Treatments for Safe Drinking Water
grade: 12
subject: Chemistry
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character: Dr. Emily Carter
topic: Innovative Water Purification Techniques
grade: 12
subject: Chemistry
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character: Professor Sarah Lopez
topic: Environmental Impact of Chemical Water Treatments
grade: 12
subject: Chemistry
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character: Mr. David Green
topic: Sustainable Practices in Water Management
grade: 12
subject: Chemistry
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