code: @SuppressWarnings("unchecked")
      public static <T> int count(T list) {
          if (list == null) {
              return 0;
          } else if (list instanceof Pair) {
              return 1 + count(((Pair<T, T>)list).second);
          } else {
              return 1;
          }
      }
docs: Counts the number of elements in an isomorphic list.
  
  @param <T> the type of the elements in the isomorphic list
  @param list - a list represented by the first Pair object isomorphic to the elements, or an element when the list is trivial
  @return the number of elements discovered