3.1.5. Consider the context-free granmar G = (V, , R, S), where V = {a, b, S, A, B), = {a,b), Aa, B ABB) (a) Show that ababba E L(G) (b) Prove that L(G) is the set of all nonempty strings in {a, b} that have equal numbers of occurrences of a and b