code: @Override
    public boolean remove(int element)
    {
      if (element < 0) {
        throw new IndexOutOfBoundsException("element < 0: " + element);
      }
      int index = findElementOrEmpty(element);
      if (index < 0) {
        return false;
      }
  
      cells[index] = REMOVED;
      modCount++;
      size--;
      return true;
    }
docs: Removes the specified element from the set.