protected override double Probability(int i, int index, int branch)
{
int modulo = Tree1.Count(i);
int index1 = index % modulo;
int index2 = index / modulo;
int branch1 = branch % 3;
int branch2 = branch / 3;
double prob1 = Tree1.Probability(i, index1, branch1);
double prob2 = Tree2.Probability(i, index2, branch2);
return(prob1 * prob2 + _rho * _m[branch1, branch2] / 36.0);
}
