Prove that grammar G is ambiguous where S, A, B are variables and S is a start symbol. a,b are input symbols, and productions are SaB|ab, AaAB|a, BABb|b.

ii. Prove that grammar G is ambiguous where S, A, B are variables and S is a start symbol. a,b are input symbols, and productions are s+aBjab, AAB|a, b