character: Dr. Emily Brown
topic: Advanced Techniques in Purification
grade: 11
subject: Chemistry
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character: Professor John Smith
topic: Innovative Methods in Chemical Separation
grade: 11
subject: Chemistry
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character: Dr. Sarah Lee
topic: Applications of Chromatography in Purification
grade: 11
subject: Chemistry
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character: Professor Mark Johnson
topic: Modern Filtration Techniques for Chemistry
grade: 11
subject: Chemistry
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