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The National Office of Academic Conferences (N. O.A.C.) wants to keep track of the conferences attended...

The National Office of Academic Conferences (N. O.A.C.) wants to keep track of the conferences attended by university researchers. It gives you the following information: A university is identified by its name and located in a particular city. A university has many researchers, each of whom can only be associated with only one university. A researcher is identified by an identification number, and has a name, phone, and email address. A researcher can attend many conferences. A conference is identified by an identification number; it also has a name, a location, and a date. For each conference, a researcher may or may not present a scientific research paper. For each conference, one university is in charge of its logistic, while another university is in charge of its marketing. A university can be involved in either role with any conference.

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