static public void Shuffle <T>(this IList <T> item, RandIntSource source)
{
for (int i = 0; i < item.Count; i++)
{
item.SwapValues(i, source.GetBetween(i, item.Count));
}
}
static public int GetBetween(int a, int b)
{
return(SOURCE.GetBetween(a, b));
}