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Computer Science

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US$0.99

English Grammar

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Electronics

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Chemistry

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Agriculture Engineering

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Biochemistry 101

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US$0.99

Accounting 101

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US$0.99

Geometry

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Biology

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3.1star

Economics

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Botany 101

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US$0.99

Algebra

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US$1.35

Algebra101

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Calculus

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Aerospace Engineering

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Chemical Engineering

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Digital Electronics

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