Is there a reason why some products are repeated in All New Series and postcard sets but not in an Old School Series? I understand Pepsi, Mountain Dew, Dr. Pepper, Dunkin' Donuts and Trix as those products were done in the 70's. But what about Frosted Flakes, Lucky Charms and Ring Pop to name a few? Is there a reason those product are not done in an Old School series but repeated in ANS?