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Abstract
The main idea behind Natural Language Processing (NLP) is to develop the computer systems that can understand and synthesize human natural language. NLP was originated when the study of human-languages developed the concept of communication with non-human devices. According to the survey, many researchers explained NLP as an area of research and applications that explores how computers can be used to manipulate natural language text or speech to perform useful tasks [1].
The research and development in NLP over the last sixty years as stated by Church and Rau [2] can be categorized into the following five areas