@Override
        public @Nullable Object execute(Iterator<?> iterator) {
          return ((ListIterator<?>) iterator).previous();
        }
      };

  private final IteratorOperation newAddMethod() {
    final Object toInsert = elementsToInsert.next();
    return new IteratorOperation() {
      @Override
      public @Nullable Object execute(Iterator<?> iterator) {
        @SuppressWarnings("unchecked")

        @Override
        public @Nullable Object execute(Iterator<?> iterator) {
          return ((ListIterator<?>) iterator).previous();
        }
      };

  private final IteratorOperation newAddMethod() {
    final Object toInsert = elementsToInsert.next();
    return new IteratorOperation() {
      @Override
      public @Nullable Object execute(Iterator<?> iterator) {
        @SuppressWarnings("unchecked")