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Suppose there are three entity sets E1, E2, and E3, and there are many-to-one relationships from E2 to E1 and from E1 to E3. Prove

Suppose there are three entity sets E1, E2, and E3, and there are many-to-one relationships from E2 to E1 and from E1 to E3. Prove that there exists a many-to-one relationship from E2 to E3.

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