Question: 6. Find all unique words in your document collection. Store them in a variable words. Find the sum of TFIDF weights of these unique words.

6. Find all unique words in your document collection. Store them in a variable "words". Find
the sum of TFIDF weights of these unique words. Store them in a variable "wordsWeight".
Display the first 6 and last 6 unit words in your data set

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