docs: static boolean checkGridSize(List<List<NodeInfo>> grid ,
  								 int clusterSize ) {
  		int total = 0;
  		int expected = grid.get(0).size();
  		for (int i = 0; i < grid.size(); i++) {
  			if( expected != grid.get(i).size() )
  				return false;
  			total += grid.get(i).size();
  		}
  
  		return total == clusterSize;
  	}