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Natural Language Toolkit Natural environment Natural England Natural Bridge, Alabama Natural killer cell Natural History Museum, London Natura Natura Artis Magistra Natuna LớnTài liệu tham khảo
WikiPedia: Natural Language Toolkit http://sourceforge.net/projects/nltk/ http://aclweb.org/anthology-new/W/W08/W08-0208.pdf http://nltk.org/ http://www.nltk.org/book/ch00.html http://www.nltk.org/team.html https://github.com/nltk/nltk https://github.com/nltk/nltk/blob/develop/ChangeLo... https://github.com/nltk/nltk/blob/develop/LICENSE.... https://web.archive.org/web/20110902235619/http://... https://www.nltk.org/