11. Find an inductive definition for each set S of lists. You may use the "consR operation, where consR(L, r) is the list constructed from the list L by addit a new element r on the right end. Similarly, you may use the "headR" a tailR" operations, which are like head and tail but look at things from the right side of a list. ng c. (L e lists((a, b)) | L has the same number of a's and b's)