for (int t = 0; t < row; t++){
        	for (int v = 0; v < column; v++){
        		if(t < row && v < column){
        		assert comp.compare(people[t][v], people[t][v+1]) <= 0;
        		assert comp.compare(people[t][v], people[t+1][v]) <= 0;
        	}
        }