successor(this, right, succ());
      height = max(2, height);
      distinctElements++;
      totalCount += count;
      return this;
    }

    @CanIgnoreReturnValue
    private AvlNode<E> addLeftChild(@ParametricNullness E e, int count) {
      left = new AvlNode<>(e, count);
      successor(pred(), left, this);
      height = max(2, height);
      distinctElements++;
      totalCount += count;