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   3. Minqing Hu and Bing Liu. 2004. Mining and Summarizing Customer Reviews. In Proceedings of the tenth acm sigkdd international conference on knowledge discovery and data mining. https://www.cs.uic.edu/~liub/publicatio ns/kdd04-revSummary.pdf
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   9. NLTK documentation: https://www.nltk.org/
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   11. Keras documentation: https://keras.io/
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