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Keywords are a sequence of one or more words, providing a compact representation of a document’s content. Ideally, keywords represent, in
condensed form, the essential content of a document. The applications of keywords are:
          i) To define queries within information retrieval (IR) systems as they are easy to define, revise, remember, and share.
          ii) To improve the functionality of IR systems.
          iii) To enable a user to quickly access related material.
          iv) To enrich the presentation of search results.

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