character: Dr. Smith
topic: Advanced Filtration Methods
grade: 12
subject: Chemistry
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character: Professor Johnson
topic: Membrane Filtration Techniques
grade: 12
subject: Chemistry
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character: Ms. Thompson
topic: Chemical Filtration in Water Treatment
grade: 12
subject: Chemistry
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character: Mr. Lee
topic: Nano-filtration Applications
grade: 12
subject: Chemistry
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