character: Mr. Johnson
topic: Blockchain Technology and Its Applications
grade: 10
subject: Computer Science
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character: Dr. Smith
topic: Introduction to Cryptography
grade: 10
subject: Computer Science
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character: Ms. Lee
topic: Decentralized Finance (DeFi)
grade: 10
subject: Computer Science
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character: Mr. Chen
topic: Smart Contracts and Their Use Cases
grade: 10
subject: Computer Science
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