Question: A useful operation in databases is the natural join. If we view a database as a list of ordered pairs of objects, then the natural

A useful operation in databases is the natural join. If we view a database as a list of ordered pairs of objects, then the natural join of databases A and B is the list of all ordered triples (x,y, z) such that the pair (x,y) is in A and the pair (y, z) is in B. Describe and analyze an efficient algorithm for computing the natural join of a list A of n pairs and a list B of m pairs.

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