Q1)Let Σ = a, b}(21Points)a)Build an FA that accepts only those words that do not end in ab. b)Build an FA that accepts only the language of all words with b as the second letter. Find the regular expression for the language. c)Build an FA that accepts only those words that have more than four letters. d)Build an FA that accepts only those words that have fewer than four letters. e)Build an FA that accepts only those words with exactly four letters. f)Build an FA that accepts only those words that begin or end with a double letter. g)Describe inwords and give a regular expression for the language accepted by eachof the following FAs.