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fromnltk.stemimportWordNetLemmatizer importcsv defpreprocessing(text): # text=text.decode("utf8") tokens=[wordforsentinnltk.sent_tokenize(text)forwordinnltk.word_tokenize(sent)] stop=stopwords.words('english') tokens=[tokenfortokenintokensiftokennotinstop] tokens=[wordforwordintokensiflen(word...