public Varset Subtract(Varset varset)
{
Varset cp = new Varset(varset);
if (cp.item.Length < item.Length)
{
AlignLength(cp);
}
Varset one = new Varset(1);
one.Set(0, true);
cp = cp.Not();
cp = cp.StaticAdd(one);
cp = cp.StaticAdd(this);
return cp;
}
public Varset NextPermutation()
{
Varset vs = new Varset(this);
Varset one = new Varset(0);
one.Set(0, true);
Varset tmp = vs.Or(vs.Subtract(one)).StaticAdd(one);
Varset nextVariables = tmp.Or(tmp.And(tmp.Not().StaticAdd(one)).Divide(vs.And(vs.Not().StaticAdd(one))).RightShift(1).Subtract(one));
return nextVariables;
}