private static void SortASC(IComparable[] a)
{
Shuffle.Do(a);
SortASC(a, 0, a.Length - 1);
}
private static void SortDESC <Key>(Key[] a, IComparer <Key> c) where Key : class
{
Shuffle.Do(a);
SortDESC(a, c, 0, a.Length - 1);
}