I. (6 points) Construct regular expressions for the following languages. a) Strings with an even number of quotes. That is, 'abc, abc ' dd, aa'a'a'a are legal strings while 'a, 'a'a'ab' a' are illegal strings. a, b, b) Strings with an even number of letters. That is, e, ab, bbba, aaaaaa are legal strings while a, aba are illegal strings. 2-[a, b