EXERCISE 1 Restate each of the following languages by listing its contents. For example, if the language is shown as fr e lab S 2), your answer should be le. t b, a. b ab, bdl [x e [a, bi*2 S 2], your answer should be le, a, b, aa, bb, ab, ba. b. xyl x e la, aa) and y e laa, aaal) c. B* d. l n is less than 20 and divisible by 3] e. abn