docs: public GridCell<P> removeCellAt(int row, int column) {
  		final GridCell<P> cell = this.cells[row][column];
  		if (cell != null) {
  			this.cells[row][column] = null;
  			--this.cellCount;
  			for (final P element : cell) {
  				removeElement(element);
  			}
  		}
  		return cell;
  	}