code: public static <T> boolean isSuperset(Set<T> setA, Set<T> setB) {
          return setA.containsAll(setB);
      }
docs: This method returns true if set A is a superset of set B
  i.e. it answers the question if A contains all items from B
  @param setA set A
  @param setB set B
  @param <T> type
  @return {@code boolean} true if A is a superset of B