code: public int getCount(G g) {
          Pair<Integer> orderAndSize = new Pair<Integer>(g.order(), g.size());
          Map<G,Integer> graphs = orderAndSizeToGraphs.get(orderAndSize);
          if (graphs == null) 
              return 0;
          for (Map.Entry<G,Integer> e : graphs.entrySet()) {
              if (isoTest.areIsomorphic(g, e.getKey())) 
                  return e.getValue();
          }
          return 0;
      }
docs: Returns the count for graphs that are isomorphic to the provided graph.