character: Mr. John Smith
topic: Preventative Measures Against Waterborne Diseases
grade: 12
subject: Chemistry
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character: Dr. Sarah Johnson
topic: Chemical Treatments for Water Purification
grade: 12
subject: Chemistry
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character: Ms. Emily Davis
topic: Impact of Poor Water Quality on Human Health
grade: 12
subject: Chemistry
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character: Professor Alan Brown
topic: Chemical Principles in Water Treatment Processes
grade: 12
subject: Chemistry
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