Answer:
We have many types of correspondences. There are internal correspondences, external correspondences, sales correspondences, and personalized correspondences. By many to many correspondences we mean, a lot of people correspond with a lot many people from another department, company or market, or any set of people in fact. An internal correspondences, sales correspondences, personalized correspondences or external correspondences can be of many to many types, and as well as of others like one to one, many to one and so on.
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