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character: Dr. Echo
topic: Basic Principles of Sound Waves
grade: 9
subject: Physics
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character: Sonic Sam
topic: Properties of Sound Waves
grade: 9
subject: Physics
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character: Wavy Wanda
topic: Reflection and Refraction of Sound
grade: 9
subject: Physics
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character: Frequency Fred
topic: Understanding Sound Frequencies
grade: 9
subject: Physics
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