private SimpleGraph CreateRandomBigGraph(Random random, int numNodes, double edgeProbability = 0.5)
{
var nodeRange = Enumerable.Range(0, numNodes);
var edges = SimpleGraph
.Product(nodeRange, nodeRange)
.Except(IdentityRelation(numNodes))
.Where(e => random.NextDouble() <= edgeProbability)
.ToList();
return(new SimpleGraph(numNodes, edges));
}