private static List <T> shuffle <T>(List <T> list)
{
for (int i = 0; i < list.Count - 1; i++)
{
var ii = (list.Count - 1) - i;
if (ii > 1)
{
var j = RNG.Int(0, ii);
var temp = list[j];
list[j] = list[ii];
list[ii] = temp;
}
}
return(list);
}