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4. Use the text in the tweets as the source for the matrix to construct a document-term matrix referenced by the variable tweets.dtm. Use TFIDF

4. Use the text in the tweets as the source for the matrix to construct a document-term matrix
referenced by the variable tweets.dtm. Use TFIDF weights to find weighted document term
matrix and weighted term document matrix. Store this in variable tweets.wdtm

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