Question: Question 4 : Consider = { a b } and S = { a a a b } . How many 3 letter words do

Question 4:
Consider ={ab} and S={aaab}.
How many 3 letter words do exist in S*?
How many 3 letter words do not exist in S*?
How many 4 letter words do exist in S*?
How many 4 letter words do not exist in S*?
Question 4 : Consider = { a b } and S = { a a a b

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