public void UnrankSingletonString()
{
string s = "x";
int n = s.Length;
long r = KevinMath.LongRandom(0, KevinMath.Factorial(n) - 1, new Random());
int[] pi = RankUnrank.InitIndexArray(n);
RankUnrank.Unrank(n, r, pi);
string ps = GetPermString(s, pi);
Console.WriteLine(string.Format("r:{0} s:{1} p:{2}", r, s, ps));
}
