For the generic text summarization, given below $5$ documents in the collection as per the chronological order of mentions, answer the following questions sequentially.

a$)$ Preprocess the training document to remove the below set of tokens. Note: Treat small case vs capital case as same but retain all the words.

Stop words & punctuations: $\{$the$,$ and, are, of$,$ in$,\text{'}.\text{'},\text{'},\text{'}\}$

b$)$ Compute the saliency score of every sentence using the sum of weights of all the words in the above preprocessed sentences. Use only the new simplified formula to compute word$$s weightage. A word is considered as salient only if the calculated weight is greater than value $2.$

Weight $($word Wi$)=$ N $/($ n k $*$ w k $)$

Where,

N $=$ Number of document given in the collection

nk $=$ Total number of words$($including the duplicates$)$ in the preprocessed document collection.

wk $=$ Frequency of word i in the preprocessed document collection

c$)$ Extract summary in reverse chronological order with the top $2$ most informative documents from part b$)$s result.

d$)$ Use ROUGE$-1$ to evaluate the results of the above system summary obtained in part b$)$ w$.$r$.$t the below reference summary.

$$Ali baba and the forty thieves is the treasure of fairy tales$$