4. Find a grammar for each language. b. {a" bc" | m, n E N}. d. {a}"b" | m, n E N, where n>0}. 9. Use your wits to solve each of the following language equations for the unknown language. b. L{a, b} = {a, baa, b, bab}. d. L{A, a} = {A, a, b, ab, ba, aba}. f. L{b, A, ab} = {abb, ab, abab, bab, b, bb}