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             1.1 Expert Systems

             Before discussing ELMER, here's some information about
             expert systems. An expert system contains knowledge about a
             particular field to assist human experts or provide
             information to people who do not have access to an expert in
             the particular field. It is an information system that can
             pose and answer questions relating to information borrowed
             from human experts and stored in the system's knowledge
             base. Although they vary in design, most expert systems have
             a user interface, a knowledge base, and an inference engine.

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